Priscilla Carpenter is a young Australian vet student who has grown up on a remote cattle station in northern Australia where she has learnt to ride, swim, drive and shoot long before she turned eighteen. Now working at Melbourne Aquarium, Priscilla gets drawn into a horrific adventure when a shark attacks one of the aquarium divers. Priscilla, her best friend Bahar and her little sister Olivia become involuntary heroines trying to find out what has gone wrong. They have to utilise all their skills, bravery and scientific knowledge and finally end up in a wild chase through the suburbs of Melbourne.