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An unknown person sends a video clip to a public police email account: someone was spying on a woman through the window of her house. The next day, the woman is found dead with multiple stab wounds. When a second video arrives in the mail, the police are unable to identify the victim. The man who found her is so traumatised by what he saw that he cleans the entire house and tucks the woman into bed. He may have seen vital evidence - but he is now in a state of shock and cannot be questioned.

The fifth book in Lars Kepler's cycle continues to tell the story of the working days of Commissioner Jonah Lynn and his colleagues, agent Saga Bauer and doctor Erik Maria Barka.