Sent to Japan on a routine police escort, Officer Zhu is excited to have the chance to requalify for full-time duty as a police officer. However, after a series of mishaps, the mission goes terribly wrong and the suspect Officer Zhu is escorting suffers a mysterious death. Zhu enlists the help of wok-wielding restaurant owner and a former undercover inspector to solve this murder mystery in the new best action-comedy movie from martial arts superstar Donnie Yen.