Ruth Lennox, mother of three children and happily married, is found murdered. But why did the beloved and socially engaged woman have to die? Inspector Karlsson calls in psychotherapist Frieda Klein for help, despite her strict instructions to stay out of any investigations since their last case together. Frieda soon has her doubts about the idyllic situation: the Lennox family's life seems just too perfect to be true. And the deeper she looks behind the facades, the larger the number of suspects becomes.