Two years have passed and the once-unbreakable bond between best friends Katie, Trudi, Jessica and Siobhan has been shattered. As the girls gather it's clear their relationship has changed dramatically: there's tension in the room and no happy greetings. What could have happened to bring them to this?Six months earlier, Katie returned from Australia after her relationship with Dan failed. Her life isn't back on track; she's lonely but pretending she's fine. When her widowed mum Vivienne turns up on her door…