Blood sisters : a novel

Three little girls set off to school one sunny morning. Within an hour, one of them is dead. Fifteen years later, Kitty can't speak and has no memory of the accident that's to blame. She lives in an institution, unlikely ever to leave. But that doesn't keep her from being frightened when she encounters an eerily familiar face. Art teacher Alison looks fine on the surface. But the surface is a lie. She's struggling to make ends meet and to forget...