Kate (Halle Berry) works as a diving instructor. She also goes by the name 'Shark Whisperer' since she specializes in sharks. The business, on the other hand, has gone down in recent years since a white shark attack and killed a diver on her guard. The memory of the attack has plagued her for 9 years and left her unable to return to the depths. With bills piling up and the bank threatening to seize her boat, she is also struggling financially. After much doubt and many rounds with herself, she says yes when her ex-boyfriend comes with a very tempting opportunity to lead a wealthy businessman on a dangerous shark dive - outside the cage. The nightmare from the deep still sneaks around down there - more meat hungry than ever.