Ruth Lennox, housewife and mother of three, is found dead in a pool of her own blood. DCI Karlsson can't piece together a motive and calls in Frieda, hoping her talents will offer a new angle on the case. When it emerges that the mother was hiding a scandalous secret, her family closes ranks. Frieda herself is distracted, still reeling from an attempt on her life, and struggling with her own rare feelings of vulnerability. Then a patient's chance remark sends Frieda down a dangerous path that seems to lead to a serial killer who's long escaped detection.