Forty and single, Terry has a quiet and ordered life in picturesque Delray, Florida. A nurse at Mission Care private hospital for the elderly and disabled, loved by her patients for her kindness and thoughtfulness, she lives alone in the comfortable house she inherited from her mother five years ago, and rents out the cottage behind it. Alison Simms spots the rental notice posted in the hospital, and blows into Terry’s life like a tropical storm. In her twenties, tall and slim, full of open charm and infectiously enthusiastic, Alison is impossible not to like. “It would be nice having someone around who made me laugh,” thinks Terry. Alison loves the cottage, right down to the colour combination, and moves in immediately. Terry, usually responsible and pragmatic, surprises herself for failing even to ask for references, but she is drawn instinctively to Alison, and realises she wants her to stay. Alison fills a gap in her life, bringing friendship and warmth. With her sweet tooth and ravenous appetite, the young woman gratefully devours Terry’s home cooking and buys her generous gifts. She even gives her a makeover and a flattering new haircut, helping Terry charm the handsome son of one of her dear, ailing patients. Alison, full of life, brightens the days that are usually spent caring for the old and the sick. Despite the difference in their ages, the two women are comfortable together; it feels like they’ve been friends forever. Yet almost simultaneously, Terry begins to have suspicions about Alison. How much does she know about her, really?