Sunday Morning Coming Down: Nicci French

Psychotherapist Frieda Klein's home is her refuge until she returns to find it has become a disturbingly bloody crime scene. Beneath the floorboards the police have found the body of a man she had hired to help protect her.
The killer's message is all too clear: you're mine.
When those closest to Frieda begin to be targeted, the picture becomes more skewed: the patterns unclear.
Unless Frieda can find and stop whoever is threatening her friends and family, her love and loyalty could come at a truly fatal cost...