The London suburb of Croydon, 1964: Helen Hansford is unmarried and in her thirties. Something of a disappointment to her middle-class parents, she's an art therapist at the Westbury Park psychiatric hospital, where she has been having a rebellious love affair with her colleague Gil, a dashing but married doctor. One spring afternoon they receive a call about a disturbance at a derelict, vine-covered Victorian house a few miles up the road. There...