When a millennial couple and a Gen X couple fall into an obsessive friendship, envy turns deadly in this addictive novel of suspense by the international bestselling and award-winning author of Our House. When Clare befriends a new young woman at work, she and her partner Jamie are living an affluent but predictable life in an elegant house by the river. With fiftieth birthdays not far away, they are ready for new adventures, and Melia and her boyfriend Kit bring a shot of yo