The case, which is taken by Patrick Kenzi and Angela Gennaro - private detectives from Boston - is not easy. Psychiatrist Dayandra Warren and her student son have mysteriously drawn the wrath of an Irish mafia killer and are in need of protection. The investigation undertaken by the detectives coincides with the outbreak of bloody murders in the city, committed with particular cruelty. The perpetrator's handwriting points to one person - a serial killer who has been serving a life sentence for 20 years. Is it possible that he still has assistants on the loose? Shortly before his death, all victims receive their photos by mail. This photo also comes to Angela .. Time to solve the terrible mystery, the origins of which lie in the crime of a quarter of a century ago, detectives are less and less.