A professor tries to convince the residents of a small town that a series of attacks are the handiwork not of mountain animals but of a rare river-dwelling shark.

A former high school student, Jason Copeland, returns to his school to take his revenge on the teachers for failing him out of school.

Sydney Carpenter is a devoted mother to her young son, and is now accustomed to the puzzling existence of her mysterious, non-communicative husband, Matthew. When her husband and son are suddenly lost at sea after a boating accident, Sydney's comfortable existence is shattered. Although overwhelmed by her grief, Sydney cannot ignore the strange pieces from her husband's past that continue to make their way into the present.