An LAPD SWAT officer becomes embroiled in a high-stakes crisis when a vengeful bomber rigs a city bus to explode if its speed falls below 50 miles per hour. He is thrust into the situation after a seemingly unrelated rescue operation leaves the bomber feeling insulted and seeking retribution. Upon learning of the threat, the officer quickly takes action, boarding the moving bus in a daring and hazardous maneuver. Once aboard, he discovers a group of unsuspecting passengers who are oblivious to the danger they are in. The officer must maintain calm while figuring out how to keep the passengers safe and the bus speeding through the traffic-clad streets of Los Angeles.

As the tension mounts, a quick-thinking passenger becomes an impromptu ally when the driver is incapacitated. Together, they form a partnership, navigating the perilous scenario with resourcefulness and courage. While the police work tirelessly to clear the roads and coordinate support, the bomber watches from afar, manipulating events to ensure his plan goes uninterrupted. The city becomes a labyrinthine track, with the bus as a bomb on wheels, creating a specter of chaos through every sharp turn and close call on its path. The officer and his new companion must keep their wits and stay one step ahead of the catastrophe, as every tick of the clock brings them closer to an uncertain fate.