Mistaken Identity and Role Confusion

The plot hinges on characters being in the wrong berths, wearing each other's clothes, and being confused for one another, leading to a cascade of misunderstandings and false accusations.

The narrator's belongings are swapped, leading to confusion about his identity and the discovery of a murder in the wrong berth.

The young woman mistakes the narrator for someone else due to his borrowed coat, highlighting the theme of mistaken identity.

The narrator occupies the wrong berth, wears another man's clothes, and is mistaken for a murderer; his true identity as Lawrence Blakeley is only gradually revealed.

The narrator expects a male burglar but discovers the intruder is a woman, challenging his assumptions and highlighting the theme of mistaken identity.