Psychotherapist Frieda Klein thought she was done with the police. But once more DCI Karlsson is knocking at her door. A man's decomposed body has been found in the flat of Michelle Doyce, a woman trapped in a world of strange mental disorder. The police don't know who it is – and Michelle can't tell them. But Karlsson hopes Frieda can help. Painstakingly, Frieda uncovers a possible identity for the corpse: Robert Poole, a master conman. But the deeper Frieda and Karlsson dig into Poole's past, the more of his victims they encounter – and the more motives they find. But whoever murdered Poole is determined to stay free – and anyone that gets too close will meet the same fate.