The midnight express, between one and three in the morning. The passenger in compartment three of sleeping car A slid the inside bolt before going to sleep, as she always does, with her jewel case in the luggage net. At three the bolt was still across on the inside, the window was still shut, and the net was empty. Sleeping car A can only be reached through the luggage van or through car B.
A liar lies about everything they say.