In the summer of '69, the hard-living rockers of the British Invasion still rule London when former Rolling Stone Brian Jones is found floating in the pool of his palatial home. On a quiet residential block that should be far removed from the swinging party scene, Detective Sergeant Cathal Breen investigates the murder of a young woman. But the victim, known professionally as Julie Teenager, was a call girl for the rich and famous. Her client list is long, and thick with suspects-all rich, powerful, and protected. As DS Breen hones in on his prime target, he receives a pointed warning: Watch your back. Fortunately, Breen doesn't have to work alone. His keenly intuitive, deeply moral partner Helen Tozer, despite the pregnancy that's interrupted her policing career, can't help being drawn into the case of a girl used and cast aside.