When recently widowed Vivien announces her love for a new man, Mark, it throws her family of adult children into chaos. The siblings’ suspicions about Mark are fueled by rising tensions in their own lives. Helen’s focus on her job has led to a rift in her marriage, Jake’s gambling debts have caused his wife and kids to leave him, and Natalie is lying to everybody about her secret relationship. Meanwhile, Vivien’s neighbour, Mary, is simply trying to protect the family she has known for years. But in a few weeks one of these people will be lying on the beach, terribly injured – perhaps dead.