'Blood Work' - that's what Terrell McCaleb used to call his job at the FBI. Until a heart condition forced him to take early retirement, he headed all investigations of serial murders in the Los Angeles area. Now he is recovering from a heart transplant operation and leads a quiet life. His goal is simple - to finish restoring the fishing boat he lives on in Los Angeles Harbor and return to his hometown on Catalina Island. But McCaleb's calm seas turn rough when a story in the L.A. Times brings him face-to-face with Graciela Rivers, a darkly intriguing woman who hooks him with the story of her sister's unsolved murder. Against doctor's orders and his own better judgment, McCaleb agrees to take up the case. As he sifts through the evidence, it seems at first like a random crime. But then he notices details that don't make sense - until he looks at the case from a radically unsettling point of view. Soon Terry is on the trail of a killer whose crimes are more baffling and horrifying than anything he has ever encountered. It's a mind-bending, breakneck case that leads McCaleb into the darkest place he's ever known, unsure whether he even wants to survive his own investigation.