Two best friends torn apart by a life-altering secret. When twelve year olds Kat and Blake meet at Camp, they have an instant connection. But everything falls apart when they learn they're not just best friends, they're also half sisters. Confused and betrayed, their friendship instantly crumbles. Fifteen years later when their father dies suddenly, Kat and Blake discover he's left them a joint inheritance: the family beach house in Destin, Florida. The two sisters are at odds. Kat and Blake reluctantly join forces to renovate the dilapidated house with the understanding that Kat will try to buy Blake out at the end of the summer. As the weeks pass, the two women realize the most difficult project they face this summer will be coming to grips with their shared past, and learning how to become sisters.