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 admitted he's been unfaithful. Her new client is good-looking and talented, but tormented by an intriguing phobia, which Jessica is determined to investigate. On an emergency visit to the Morgans' remote cliff-top mansion, Jessica discovers that Gwydion's former au pair was mysteriously drowned in the bay nearby. Could the tragedy somehow be linked to Gwydion's disorder? As the quest to help her client deepens, 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 ...