The Deep — Jennifer Fox

Everyone always thought that Lake Vintage was the perfect spot for a relaxing vacation, including Samantha Montgomery. For as long as she can remember, she and her friends spent the entire summer there until one fateful summer when everything changed. After four years have gone by since her last visit to the lake, she starts remembering things that happened there and she starts looking for answers but what she finds out is something that goes beyond what she could ever have imagined.