In her old life, Abby was a high school volleyball star with a textbook-perfect future. Then Abby and her sister, Brooke, receive a letter from their estranged dad informing them he has Huntington's disease, a fatal, degenerative disorder. And when the sisters agree to genetic testing, one of them tests positive. Fleeing to Catalina Island for the summer, Abby is relieved to be in a place where no one knows her tragic history. When she meets aspiring...