Actor Gwydion Morgan's dramatic appearance at Jessica Mayhew's psychotherapy practice coincides with a turbulent time in her own life - her husband has just revealed that he's spent the night with a much younger woman. Gwydion, son of the famous Evan Morgan, is good looking and talented but mentally fragile, tormented by an intriguing phobia. Jessica is determined to trace the cause of his distress. So when his mother phones to say he is suicidal, Jessica decides to make a house call. The Morgans live in a grand cliff-top mansion overlooking a rocky bay with its own private jetty. It's a remote and somewhat sinister place. On her visit, Jessica finds out that an au pair who looked after Gwydion as a child drowned in the bay in mysterious circumstances. Could it be that Gwydion witnessed her death? In her quest to help her client, Jessica finds herself becoming embroiled in the Morgans' poisonous family dynamic. At the same time, she has to deal with the demands of her own domestic life: her struggle to keep her marriage intact, as well as her older daughter's increasingly defiant behaviour. And then, of course, there is the growing attraction she feels towards her new client . .