Pony, the youngest of the Carteret daughters, has never been afraid to live dangerously ; and, for all that she infuriates him, she's always been her brother William's favourite. When her body is found in Lake Aral, the deepest lake in Vermont, something doesn't seem to fit. How could Pony, a strong and experienced swimmer, drown within feet of the family's exclusive holiday home, while her baby son looked on from the shore?