Murder in Hyde Park

An early-morning jogger is murdered in Hyde Park. It's the center of London, but no one saw him enter the park, no one saw him die. He carries no identification, only a water-logged phone. As the pieces unravel, it's clear that the dead man had a history of deception. Is the murderer one of those that loved him? Or was it someone with a vengeance? It's proving difficult for DCI Isaac Cook and his team at Challis Street Homicide to find the guilty person—not that they'll cease to search for the truth, not even after one suspect confesses.