Investigating the murder of a millionaire who was killed with a weapon linked to the deaths of four San Francisco criminals, pregnant detective Lindsay Boxer is horrified to realize that the killer could be among her closest friends.

In this #1 NYTThe hunt for the killer lures Lindsay out of her jurisdiction and impacts her in dangerous ways. She suffers unsettling medical symptoms, and her friends in the Women's Murder Club warn her against taking the crimes to heart. But with lives at stake, the detective can't help but follow the case into terrifying terrain. A decorated officer, loving wife, devoted mother, and loyal friend, Lindsay has always acted with unwavering integrity....