Travel journalist Lo is on a luxury cruise with ten cabins. She hears a scream in the night. She sees blood. But the passenger in Cabin 10 doesn't exist — according to the manifest. Nobody believes her. And now the ship is in the middle of the North Sea with nowhere to run.
Clean — the locked-room mystery drives everything.
Skip if you dislike:
Moods: Claustrophobic Tense Twisty Atmospheric
Tropes: Locked Room Cruise Ship Journalist Missing Person
Yes, complete standalone.
Modernized locked-room mystery — Christie would approve.
Very — she's the queen of atmospheric thrillers.