In Los Angeles, the Chinese Ambassador is delivering a speech at the World Criminal Court, revealing his intention to disclose the identities of key figures within the Triads, one of the most powerful criminal organizations in the world. This event sets the stage for a critical alliance: Detective James Carter of the LAPD, who is now working as a traffic cop, and Chief Inspector Lee from the Hong Kong Police, who is assigned to protect the Ambassador. Their reunion is short-lived when an assassination attempt on the Ambassador disrupts the event, pulling Lee and Carter into a dangerous quest to track down the criminals responsible. As they follow the trail, they uncover a deeper conspiracy involving the Triads.

The investigation leads Lee and Carter to Paris, where they must navigate unfamiliar territory and a web of intrigue. The city of lights serves as a backdrop to their pursuit, fraught with action, humor, and moments of peril as they encounter a diverse cast of characters, including a cab driver with his own agenda and a potent female assassin linked to the Triads. Their mission becomes increasingly complex as they unravel the mystery behind the assassination attempt, which ties back to a secret that could jeopardize international relations. The duo's dynamic, marked by their contrasting personalities and mutual respect, adds an engaging layer to their quest as they race against time to prevent a global crisis.