Survival instinct

"Stranded and left to die...Returning to Devil's Island--the place that haunts her past--is frightening enough for Abby Caldwell. When her ride home mysteriously disappears, terror starts closing in. The island can be deadly, and no one knows that better than Abby. At least she's not alone. Scott Frasier, a former college classmate, is there along with his mother and stepfather. But then Scott's mother goes missing. Scott and Abby are forced to face the truth--all they have is each other...and ruthless enemies determined to make sure they don't leave the island alive."--p.[4] of cover.