McCaleb is enjoying retirement while living on his fishing boat. A woman approaches him and requests his help to find her sister's murderer.
When he tells her he can't because of his heart transplant, she responses, yes, it is my sister's heart. It is keeping you alive and I think you'd want to find her killer.
He agrees and begins a search putting pieces of an intricate puzzle together that leads to the killer.
Nothing is straight forward in Connelley's novels. Along the way police receive an anonymous call and suddenly McCaleb becomes the main suspect. The evidence he was collecting is viewed as evidence of the crimes.
The book starts off with a bang and continues to a strong conclusion.