Tally Whyte has seen a lot of dead bodies in her years with the Massachusetts Grief Assistance Program, but this is the first time a murder victim has been brought to OCME by the murderer himself. During the night, the killer broke into the Office of the Chief Medical Examiner, aka the Grief Shop, and left behind a tragic calling card—the body of a young girl, bearing a message: Sins of the Fathers. The girl's playmate is also missing. Could she be another victim? Or can Tally save her before the killer strikes again? As the mysteries multiply and Tally's life is threatened, she scrambles to prevent another child from falling prey to a madman's warped sense of justice.