Discovery of the Weapon

Mrs. Hubbard bursts into the dining car, hysterical, claiming she found a blood-stained dagger in her sponge-bag. Poirot and the others examine the weapon—a cheap Oriental dagger—and confirm it matches the wounds. Poirot notes the sponge-bag was hanging on the communicating door handle, suggesting the murderer placed it there while escaping through her compartment.