The journalist Lo Blacklock receives an invitation to spend a week aboard a boutique cruise liner. The trip among the Norwegian fjords will help her recover from the robbery of her home, after which she has a nervous breakdown. It's also the perfect opportunity to advance her career and change her life.

The sky is cloudless, the water crystal clear and the select guests look so sophisticated and pleasant. But it's not long before leaden grey clouds are hanging over the ship, the deck is swaying with violent winds. Lo is suddenly awakened in the night by screams and suspects a woman has fallen overboard.

In the morning she finds that none of the passengers are missing and the journey continues as if nothing had happened. What if she had made a mistake? What if she started to lose her mind? But if what she sees is true, Lo will fall into a death trap.

„The woman in cabin 10“ is a crime masterpiece in which a woman must stop a killer no one believes exists.