A passenger lies dead aboard the Nightline, a 1930s luxury sleeper racing through the dark, and you have until dawn to name the killer. Question six fellow travellers — each a real character guarding a real secret — then cross-examine: carry one passenger's testimony to another and watch the contradiction crack their alibi wide open. The mystery is written fresh every journey and proven consistent before you board, so the lies you unravel are genuine — but the terminus clock never stops, and you get only one accusation. Make it count.