"When Tessa arrives at the little house by the lake with her two children, it is an escape. The rental house may be a bit small - but it's theirs for the summer. A place to hide...However, their isolation is disrupted by the family from the big house next door. Three children and their glamorous mother Rebecca - who seems determined to invite Tessa into their lives. Rebecca, however, is harbouring a dark secret. And when it becomes too much for her...