To celebrate successfully passing the exam, seven students from Tulane University, including Nick (Dustin Milligan), Gordon (Joel David Moore), Beth (Katharine McPhee), Merrick (Sinqua Walls), Maya (Alyssa Diaz), and Donal Logue (Sara Paxton), made an appointment to go to Lake Colosby, the hometown of classmate Sarah Paxton). The beautiful scenery, pleasant scenery, and the hospitality of the host made this trip full of joy and excitement. However, their youthful and turbulent years did not last long. Merrick, who was originally an athlete, was attacked by unknown creatures while surfing a motorboat and lost an arm. This accident seemed to herald their next fate. No one would have imagined that a man-eating shark in the calm lake was coveting these young men and women...