Serious and alert Inspector Lee (Jackie Chan) and talkative detective James Carter (Chris Tucker) have successfully completed two transnational missions, and this time they are faced with a more difficult task. Consul Han, who was investigating the evidence of the "Sanhehui" crime, was assassinated. Officer Lee, who felt deeply guilty, chased the killer frantically, but was helped by James Carter, who was demoted to a traffic policeman. Naturally, their strange combination of the two days began again. On the one hand, according to the clues of Consul Han, they went to Paris, the heartland where the "Sanhehui" tried every means to hide, overcome many difficulties and explore the truth; on the other hand, they also had to protect Consul Han's grown-up daughter Su Yang (Zhang Jingchu), and the killer was Kenji (Hiroyuki Sanada), Inspector Lee's good brother in the orphanage when he was a child. How will the two deal with the crisis? At the peak moment, Inspector Lee's Chinese Kung Fu will turn the tide.