Annie Porter is the woman who once went through a terrifying experience on a bus that had a bomb on it. The bomb would explode if the bus went slower than 50 miles per hour. She was saved by a police officer, and they started dating. But later, she broke up with him because he always put himself in dangerous situations.

Later, Annie starts dating a new guy named Alex. He tells her that he’s a cop, but his job is simple and not dangerous. But Annie later finds out that Alex works in the same special police unit as her ex-boyfriend, and he also loves taking risks. She thinks about breaking up with him too, but then Alex surprises her with a cruise trip. She agrees to go with him, not knowing that he is planning to propose.

During the cruise, Alex notices a man acting strangely. He finds out that the man is Geiger, a computer expert who helped design the ship’s systems but was later fired. Now Geiger has taken control of the ship and has set it on a course to crash into a big oil tanker. Alex does everything he can to stop Geiger and save everyone on the ship.