Dr. Emma Collins and her workforce are spending their third summer season on the island of Little Glad finding out the impact of local weather change on the good white sharks who come to the close by nursery yearly to present delivery. Together with the final two inhabitants of this former fishing village, their peaceable life is disrupted when a "scientific" workforce led by her ex-boyfriend and marine biologist Richard present up in search of three bull sharks who we quickly study aren't simply any bull sharks.