San Francisco police lieutenant Lindsay Boxer, the subject of a police brutality trial after a shoot-out involving two teens, retreats to Half Moon Bay to get away from the media circus and becomes embroiled in the investigation of a series of murders that puts her in mind of an unsolved case from her rookie years.

"A series of shootings exposes San Francisco to a methodical yet unpredictable killer, and a reluctant woman decides to put her trust in Sergeant Lindsay Boxer. The confidential informant's tip leads Lindsay to disturbing conclusions, including that something has gone horribly wrong inside the police department itself. The hunt for the killer lures Lindsay out of her jurisdiction, and gets inside Lindsay in dangerous ways. She suffers unsettling medical...