17.00:
When Amadeus announced the trick, you looked around the library, tapped the walls, and found no secret doors. The locks were functional, and the portholes were impossible for a human to fit through.
At exactly 5:00 p.m., Amadeus was locked in the library with three locks. Lupin, Adele and Satuola took the keys. Engineer Garin put an orange scarf on Dassin so that he could be followed when going on board, where people are dressed in wide fur coats and cannot be identified.