New York Times bestselling author Michael Connelly presents his most ambitious, most gripping achievement to date—a novel of masterly suspense and righteous obsession that will never let you go. When Graciella Rivers steps onto his boat, ex-FBI agent Terrell McCaleb has no idea he's about to come out of retirement. He's recuperating from a heart transplant and avoiding anything stressful. But when Graciella tells him the way her sister Gloria was murdered, it leaves Terry no choice. Now the man with the new heart vows to take down a predator without a soul. For Gloria's killer shatters every rule that McCaleb ever learned in his years with the Bureau—as McCaleb gets no more second chances at life...and just one shot at the truth.

Terry McCaleb, the retired FBI agent who starred in the bestseller "Blood Work," is asked by the LAPD to help them investigate aseries of murders that have them baffled. They are the kind of ritualized killings McCaleb specialized in solving with the FBI, and he is reluctantly drawn from his peaceful new life back into the horror and excitement of tracking down a terrifying homicidal maniac. More horrifying still, the suspect who seems to fit the profile that McCaleb develops is someone he has known and worked with in the past: LAPD homicide detective Harry Bosch.