Shortly before midnight, a scream echoes through Blackthorn Apartments. Seconds later, the entire building is plunged into darkness.

When the lights return, the unpopular owner of the apartment block is found dead inside Apartment 13. The door is locked, the windows are closed and the only key is discovered in the victim’s pocket. Somehow, the killer escaped.

During the investigation, detectives uncover a list containing 15,700 names. Hidden among them is the person responsible for the murder—and it is your job to find them.

Examine the clues, study the suspect lists and eliminate names as you work your way through this unusual crime-solving challenge. Every discovery will bring you one step closer to identifying the guilty person. But be careful. The killer is hiding in plain sight

  • 15,700 possible suspects 

• An atmospheric murder mystery set in an apartment block 

• Clues to guide your investigation 

• Thousands of names to examine and eliminate 

• A unique screen-free crime-solving challenge 

• The killer’s identity revealed at the end 

• Hours of entertainment for mystery and puzzle fans

Perfect for amateur sleuths, whodunit enthusiasts, crime-fiction readers and anyone who believes they could outsmart a calculating murderer.

Work alone, challenge your friends or compete with family members to see who can solve the case first. One apartment. One victim. 

15,700 suspects. Can you unmask the killer before reaching the final page?

 Open the investigation and begin searching today—the murderer is still on the loose.