Caroline's life was meant to be sorted when she made the decision to end her engagement, 3 months before the big day. With her to-do list tasks getting crossed off and her career going great guns, Caroline is sure she's now a fully functioning adult. So when her 17 year old half-sister Lexi, arrives unexpectedly at her door, it doesn't quite fit with her image that she's drunk and wearing her wedding dress! Lexi has come to stay for the summer but their relationship is strained, as Lexi is the result of their father's infidelity. An affair that led to the divorce that destroyed Caroline's mother and ruined her own childhood...