Rebecca doesn't expect to make new friends at this stage of her life. But when she becomes mother to little Amy, she finds herself spending her afternoons in the park. There she meets other mothers: first flamboyant, fun Rose, and then single-mom Lilith, whose inner strength is tangible, and whose eyes never leave her toddler. Very soon the women have formed a trio - the type of friends who feel at home in each other's kitchens - and their daughters begin to behave like sisters. But Rebecca is about to learn that friendship is not always what it seems, and that sometimes you trust the wrong people. At exactly the moment when she needs to lean on them, one of her new friends harbours a shocking secret, and the other will turn on her in a way she could never have anticipated. Her two park friends will change Rebecca's life - and her family - forever.