During a mission, station officers Sam, Yip and thier senior officer Chill, agree to take joint responsibility for a risky move instigated by hot-tempered Sam. But when they’re threatened with discipline by their superiors, Sam and Yip wimp out, letting their leader, Chill, take the rap. A year later, the three are reunited at Lung Ku Tan fire station, but their friendship has soured. In the meantime, they were set together to battle an out-of-control blaze that threatens to plunge the city into darkness...