Vivia is a hag, one of the last of her race, and can die, visit the underworld and return at will. She has a job she loves-helping London's most vulnerable supernaturals, even if her colleague Malcolm drives her round the bend on a daily basis. Then Malcolm is outed as a zombie and, along with his teenage son Ben, flees the police. When Malcolm is captured, he is only able to pass on one message before his dead brain degrades completely: 'He killed me.'As Ben remains missing, the police find decades-old corpses hidden near Malcolm's house, and Vivia begins to realise there's a lot more at stake than just a possible zompocalypse...