The Island: On a weekend vacation, Beth Anderson is unnerved when she discovers a skull on the beach. As she starts to look into this mysterious find, handsome stranger Keith Henson seems to appear everywhere she goes. He claims to be keeping an eye on her safety, but Beth senses other motives. When a body washes ashore, she may need more help than she bargained for. Because investigating is a dangerous game, and someone wants to stop Beth from playing.

Below the Surface: Briana Devon knows her twin sister would never deliberately leave her, but when she surfaces after a dive, Daria and their boat have vanished. Fighting rough waves and a fast-approaching storm, Bree barely makes it to shore, where Cole De Roca revives her. Bound to Cole by the harrowing experience, she seeks his help as she struggles to understand what happened to her sister--and what her twin, whom she thought she knew so well, might be hiding.