When Dan, a sexy film star who wants to make the transition to power producer, begins to woo Jennifer, Catherine's protective instincts are triggered: is he after Jennifer for her money and connections? Or is Catherine jealous that the ugly duckling has finally met her man? What begins as a rivalry between sisters becomes a chilling novel of psychological suspense in which one sister find herself alone on a yacht at sea, forced to defend herself from a terrifying killer in league with her sister.