Sleuth Kings Master Detective: Monster Madness

by Sleuth Kings
Immerse yourself in the case when you join Lead Detective Sullivan King in this interactive mystery

Product Details

Uncover Evidence, Decode Clues & Solve the Case

Receive a case file full of clues, evidence, and puzzles when you immerse yourself in this interactive mystery each month. As you work with Lead Detective Sullivan King, you'll uncover evidence that will bring you one step closer to solving the case. *Ships January 4th. This will not arrive in time for Christmas*

  • For all ages; perfect for parties and date nights.
  • Receive a physical case file full of clues.
  • Interact via email with Lead Detective Sullivan King to uncover additional evidence.
  • Work at your own pace. Master Detective cases take experienced puzzlers approximately 2-3 hours to solve. Rookie Detective cases for those new to puzzling take approximately 1 hour.
  • Monthly subscription automatically ends after 4 months; one standalone case delivered per month

Sneak Peek

Photo of Sleuth Kings Master Detective: Monster Madness current box Master Detective: Monster Madness

Master Detective: Monster Madness

Sullivan King had only heard whispers about a new criminal group – until their reign of terror made things personal for him. The group – filled with self-proclaimed zombies, vampires, and other monsters – has its hand in everything from selling drugs to abducting people. Although they have police baffled, Sullivan is sure of one thing: he’s going to do whatever it takes to stop them. Can you help Sullivan uncover the group’s monstrous secret and bring them to justice?

Order by December 31st to get this box!

Customer Questions (16)


Q: Do you need the Internet to solve the cases?Asked by Zayani M., June 2019

Hi Zayani,
Since you work with the detective via email, you do need an Internet connection as well as an email account. Some cases also include websites that you'll have to visit. That said, you will never need to use Google or any other web resource that isn't a part of the case.

by Brandon J., June 2019


Q: Is each month a case that can be solved without the next box? There is another subscription that is similar and you have to get 6 boxes to be able to solve the case.Asked by Shelly G., September 2019

Hi Shelly,
That's a great question - thank you for asking!
All of our cases are stand-alone, so you'll get a new, independent mystery to solve each month.

by Brandon J., September 2019


Q: The description says it spans over 4 case files and that the subscription ends after 4 months. However could you do only one of the four months as a stand alone case or is you need all four files?Asked by Krystiana I., May 2021

Sleuth Kings answered...May 2021

Hi Krystiana,
Thanks for reaching out.
While our subscription cases do involve an overarching story, each case is its own, stand-alone mystery. If you decide that you'd only like to try one month, that's no problem at all.


Q: I want to give this as a gift but want to designate a finite time. Do you offer that or do I have to sign up and then remember to cancel when the "gift" is over?Asked by Sharon S., December 2020

Sleuth Kings answered...December 2020

Hi Sharon,
Thanks for reaching out!
Our subscription options are set to last 4 months and then automatically end. While the subscription cases make up a 4-part series, each case is also its own complete mystery, so you can cancel at any time without worrying about your gift recipient being able to complete the mystery.
Currently, to my knowledge Cratejoy does not offer the ability for you to purchase a subscription with a customized end date, which means you would need to cancel your subscription if you'd like to send your recipient fewer than our 4 cases. Alternatively, we do sell our past cases in the "Archives" section of our website. Those may be a better option for you if you'd like to purchase a specific number of...

Reviews (96)

  1. Reviews for this product (95)
  2. Reviews for this seller (1)

Fun puzzles and interesting stories

Mar 09, 2019
Robert O.
2 Reviews
8 Helpful

I’ve tried quite a few “mystery boxes” and Sleuth Kings’ definitely at the top. The stories are great and the puzzles are challenging and fun...if you ever need help Sully’s always there for you. The e-mail exchanges with Sullivan are what makes this box unique. We’ve gotten close enough where he doesn’t threaten violence when I call him Nancy Drew. Or Holmes. Or Sugar Britches. 10% of the fun is coming up with absurd nicknames for Sullivan.
If you like single box closure and intriguing stories this ones worth a try. I know I’m hooked. I just need to figure out my plan to work through all the archived cases. 😁

Loved it, so much fun!

Nov 17, 2019
Verified Purchase
Kim W.
1 Review
4 Helpful
Subscribed for 6 months

My husband and I wanted an activity to do with our fourteen year old son. He loved and we loved it!! It was so much fun figure it out the clues and email the detective. The clues were challenging but not to the point of frustration. It took us two days to solve and we are excitedly waiting for our next case!

Excellent Puzzle Box

Oct 09, 2019
Verified Purchase
Rachel W.
1 Review
3 Helpful
Subscribed for 3 years

It's taken me too long to write a review, since I've been subscribed for so long now, but this is my favorite subscription box by far! I always have a great time trying to solve each month's case with family and friends, and the "interactive" element with Sullivan adds a fun immersive twist to the experience. Cases could probably be solved alone, but it's a lot of fun to work with others. I really like that some cases have callbacks to previously encountered characters or events, and that the puzzles and clues are always fresh and different. Sometimes the difficulty of the puzzles can vary from month to month, but there's a good hint system built into the box, and the team behind Sleuth Kings is very helpful and responsive. I was missing something in a box once and the issue was solved quickly and professionally. I also appreciate that if you're on a month-by-month plan you can skip a renewal if needed without otherwise adjusting your subscription. Overall, a fantastic experience that you should try if given the chance!!

Highly recommend!

Nov 11, 2019
Verified Purchase
Christina A.
3 Reviews
3 Helpful
Subscribed for 1 month

Just received my second box. I can’t tell you how fun these are. My husband and I love working through these. They challenge both of us. We will take breaks and then one of us will shout I think I know what to do. Really good bonding time for us.

Mother/Daughter bonding time!

Sep 09, 2019
Verified Purchase
Sarah G.
1 Review
2 Helpful
Subscribed for 1 year

My daughter, Zoey, and I love these boxes from Sleuth King! She wants to be a K9 Police Officer/Detective and these cases are right up her alley! We have a blast trying to figure out the clues. She can't wait for the next box to come!

Really fun!

Jan 25, 2019
Verified Purchase
Wendy F.
23 Reviews
3 Pictures
36 Helpful
Subscribed for 4 months

So this was our first mystery subscription and the experience has been terrific. I ordered one case just to try it out first; received the case quickly and Detective Sullivan was always quick with a reply to help when we asked for it. Signed up for the subscription and we completed the second case on our own. So there are varying levels of challenges, which is great to keep things different each time. The packages have been well made, complete, and very detailed. If you are looking for a new activity this is a great subscription to try.

So worth it

Sep 23, 2019
Verified Purchase
Debbie D.
1 Review
1 Helpful
Subscribed for 10 months

I've only completed one box but I am already addicted. The puzzles were fun and not too challenging but not too easy. So much fun!!!


Nov 02, 2018
Verified Purchase
Cathy S.
4 Reviews
3 Helpful
Subscribed for 6 months

The starter envelope was fun. I needed help, as usual, but I think I will like this very much. First box should be here before long.


Nov 26, 2018
Verified Purchase
Nesa W.
2 Reviews
5 Helpful
Subscribed for 27 days

This box is so much fun! You get to unleash your inner detective. The customer service is amazing. I highly reccomend

Best, most fun mystery solving cases

Jul 10, 2019
Verified Purchase
Laurie L.
1 Review
1 Helpful
Subscribed for 4 months

Love these mysteries to solve. I love these as you have to use all your brain power to get to the final answer. Love that you can get help when you are stuck. These can be done alone or with others. They can take no time to solve or longer if you get into a quandary! Like to take on great cases, this is the game for you. Arrived on time and in perfect shape. Love the extras like a fortune cookie or magic wand. So much fun. So much so, that I have ordered four of these and will finally get them all! Go for these and the price is right,too!

Past boxes from Sleuth Kings Master Detective: Monster Madness

Master Detective Case 025: The Haunting

Master Detective Case 025: The Haunting

Renea Evans' dream home suddenly became a nightmare when she began seeing apparitions and receiving terrifying messages. Convinced that her new home is haunted, she's asked Sullivan to investigate. If he can figure out the ghost's identity, Renea hopes that she can make it move on before she loses everything she’s worked for. Can you help Sullivan get to the bottom of the ghost's otherworldly messages before Renea is forced to abandon her home? Sign up to find out!

Master Detective Case 026: Sparky

Master Detective Case 026: Sparky

Celest St. Claire never expected that she’d be targeted by a dangerous stalker dressed as a giant mascot. Little is known about the stalker other than the fact that they’ve put multiple people in the hospital. With only three days to play their game and meet them face-to-face, Celest needs your help before she becomes their next victim. Can you help Celest and Sullivan find the stalker and put an end to their masked mayhem before it’s too late?

Master Detective Case 027: Krampus Kidnappings

Master Detective Case 027: Krampus Kidnappings

Asuna Yukimura has been kidnapped by Krampus the Christmas Devil. Now, being held for ransom, Asuna intends to make Krampus regret ever targeting her. She has only one option - create as much trouble as she can. Luckily, she still has her cell phone, and Sullivan is only an email away. Can you work with Sullivan to help Asuna beat Krampus at his own game and escape? Sign up today to find out!

Master Detective Case 028: Year of the Cat

Master Detective Case 028: Year of the Cat

Spencer Dye is being targeted by the serial arsonist known only as "The Cat," which means one thing – her life could go up in flames at any moment. To save herself, Spencer has only one option: find the connection she shares with The Cat. Then – and only then – will she stand a chance of stopping them. Can you help Sullivan and Spencer extinguish a burning grudge that spans decades? Sign up today to find out!

Master Detective Case 029: Love Hurts

Master Detective Case 029: Love Hurts

John Malvone broke his ex-girlfriend’s heart, and now she intends to break him. The problem is, he’s not sure which ex is coming after him. John has survived three attempts on his life so far, but his luck won’t hold out forever. If he doesn’t figure out who wants him dead – and soon – he won’t survive his spiteful lover’s next attack. Can you help John stop his ex before she decides he can’t live without her? Sign up today to find out!

Master Detective Case 030: Black Magic

Master Detective Case 030: Black Magic

Mina Yen, a Magician's Assistant, was murdered on stage during a performance. Although it's clear that the illusion was sabotaged, the police aren't sure who is responsible. Sullivan has been hired to clear the lead suspect's name, but he's not convinced that the man is innocent. If he can't find evidence that will help put the real murderer away - and fast - he's afraid it's only a matter of time before they kill again.

Master Detective Case 031: Dark World

Master Detective Case 031: Dark World

Jack Hill, the owner of Dark World - an interactive sci-fi museum - has gone missing. Sullivan is afraid he's been murdered, but Jack's wife believes that the museum holds the key to bringing her husband back. With no other leads, Sullivan's last hope is to search Dark World for any trace of Jack's whereabouts. If Jack really is still alive, Sullivan is afraid he's running out of time. Can you help Sullivan navigate Dark World's six kingdoms and bring Jack home?

Master Detective Case 032: Two Ring Circus

Master Detective Case 032: Two Ring Circus

Sullivan’s office has been ransacked and one thing is clear – the Moretti crime family is behind the break-in. The thieves were after a diamond and found one – just not the one they wanted. Instead, they stole a wedding ring that once belonged to Sullivan’s late mother. Worse, before they could sell the ring, they managed to lose it. Can you help Sullivan race against the Moretti family to get his mother’s ring back? Sign up today to find out!

Master Detective Case 033: Death Of A Stuntman

Master Detective Case 033: Death Of A Stuntman

John Malvone is dead and his killer is ready to strike again. What was supposed to be a harmless murder mystery dinner has turned into a deadly party. Nobody knows what the killer wants, but one thing is clear: if they don’t play his game, Sullivan and Celest are next. Can you help Sullivan and Celest put a stop to the twisted party before they end up dead? Sign up today to find out!

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Shipping Policy
Orders placed today ship by January 11
Following boxes ship on the 4th of each month.
Renews monthly on the 11th
Subscription deadlines are the last day of the month. Case files ship by the 4th of each month! FREE US shipping for Master Detective cases! Subscriptions span...
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