Briana Devon knows her twin sister would never deliberately leave her - but when Briana surfaces from the depths of the sea, Daria and their boat have vanished. The only way to survive the rough waves and approaching storm is to swim to safety.
Exhausted and terrified, Briana barely makes it to a tiny barrier island, where she meets Cole DeRoca, who has also taken shelter. Bound to Cole by the harrowing experience, she turns to him as she struggles to understand what happened to her sister. What was her twin hiding? What really transpired that terrible afternoon? And what secrets lie dormant below the surface?