A rare manuscript vanished from the academy library between 20:00 and 21:00. Only three people had keys.

Welcome to the Meridian Art Gallery, detective. At 8:30 this morning, the 16th-century Iznik plate — the star of today's auction — was found replaced in the vault with an expertly crafted replica. The original is missing. Insured value: 12 million TRY. The gallery closed to visitors at 8:00 PM last night. Only four people were in the building overnight: manager Selin Aydın, restorer Kerem Doğan, security guard Mustafa Yılmaz, and intern Deniz Kaya. Vault records show it was opened at 9:12 PM. Question the suspects, examine the evidence, and prove who made the switch.

A gallery unveils a 'newly discovered' 18th-century painting. Three insiders vouch for it. One is lying.

A café's card reader shows an order placed at 07:58. But the shop opens at 08:00, and only staff can process orders. Which employee is lying about their arrival?

A research sample was destroyed overnight when someone turned off a freezer. Keycard logs show three entries.

A passenger boards a two-stop train and never disembarks. Three others share the carriage. One is not who they claim to be.

A private medical detail shared by a colleague only during a confidential meeting appeared in an anonymous email sent to the project team's internal mailing list at 10:15. The detail was known to the victim and the three other people in that meeting.