Orient Express

From BoardGameGeek:

A murder mystery style game. You must collect clues from different rooms, but you have only a limited time before the train reaches the station. If you don't catch the culprit before then, the killer will escape. It is unique in that the solution is NEVER 100% sure. You must make some logical assumptions to get the killer. The killer is different each time based on a number of prewritten murder cases (extras are sold separately).