In the heart of a lively wedding celebration in New York City, Ma Hon Keung, a seasoned police officer from Hong Kong, finds himself caught in a whirlwind of urban turmoil. Hosted by Uncle Bill, Keung is introduced to Whitney, his soon-to-be African-American bride, amid the modest shelves of a supermarket owned by Elaine. With the wedding festivities underway, Keung is gifted a classic car by Uncle Bill's friend Steven Lo. However, the joyous atmosphere shifts dramatically when a boisterous street gang launches a motorcycle race right outside Uncle Bill's residence. Without a moment’s hesitation, Keung leaps into action, risking his safety to avert a potentially devastating disaster.
This act of bravery ignites a fierce rivalry with the gang, who then set their sights on Elaine's supermarket, attempting to rob and vandalize it amidst a series of brutal encounters. As the bikers relentlessly pursue Keung, he finds refuge in the caring companionship of his neighbor Nancy, an alluring lingerie dancer with connections to the gang, and her younger brother Danny, a Chinese-American paraplegic who quickly grows fond of Keung. Despite his injuries from the conflicts, Keung returns home, where Nancy and Danny apply their nurturing touch to aid his recovery.
The plot thickens as a rogue gang member, Angelo, becomes entangled in a botched diamond deal, making away with valuable gems that he later stashes in a seemingly innocuous cushion—unbeknownst to him, this cushion will end up in Danny's wheelchair. As Keung forms a close bond with Nancy and advises her to steer clear of criminal influences, the gang starts to take notice of their relationship, intensifying their efforts to target them. In a series of devastating attacks, the bikers return to Elaine's supermarket, wreaking havoc and leaving a path of destruction in their wake.
Complications arise when two of Angelo's men are captured by White Tiger, the sinister leader of a larger crime syndicate, prompting them to search for the stolen diamonds. As the tension mounts, Keung and Nancy gather their courage to infiltrate the bikers' hideout, leading to an exhilarating confrontation where Keung faces his foes once more, emerging triumphant in a gritty battle for justice.
In a twist of fate, Keung solidifies an alliance with Tony, leading a transformation among the street gangsters, convincing them to abandon their criminal activities and join the fight for justice. This crucial partnership plays a key role in dismantling the syndicate’s operations, ultimately revealing the coveted diamonds hidden within Danny’s wheelchair.
However, the planned exchange turns chaotic when Nancy and Tony are taken hostage by the syndicate, leading to a frenzied scene where they use a tow truck to demolish Elaine's supermarket, sparking further pandemonium. As the syndicate’s men seize a hovercraft, a high-octane chase erupts across the Hudson River.
In the heat of the pursuit, Keung joins forces with the New York Police Department (NYPD), engaging in a thrilling chase where he creatively uses a six-foot jagged sword acquired from a museum, securing it on a Lamborghini Countach before driving it into the hovercraft, causing a spectacular crash. Taking aim at one of White Tiger's operatives, Keung fires non-fatally to extract critical intelligence about the syndicate leader's location.
Armed with this vital information, Keung commandeers the repaired hovercraft and steers it toward a golf course, where White Tiger is enjoying a game with his loyal followers. With precision and vigor, Keung crashes into the group, leaving White Tiger vulnerable and exposed on the pristine green, setting the stage for the ultimate showdown.
