Limber sports equipment salesman Buck Yuen (Chan) gets chewed out by his boss (Cheung Tat-ming) for not pushing the expensive hardware in their failing store when an affluent customer and his bimbo wife stop in for a browse. While on a lunch break at a local shopping mall, Buck single-handedly foils a bank robbery and his heroics make him a media sensation. Haggard private detective Many Liu (Eric Tsang Chi-wai) tracks Buck down and directs him to a lawyer (Alfred Cheung Kin-ting) hired by a dying Korean millionaire hoping to find his long lost son. Buck (who was turned over to an orphanage as a baby) learns from reporter Carmen Wong (Kim Min Jeong, whose performance evokes unfortunate memories of the inept female leads from WHO AM I?) that the man was a notorious North Korean agent who defected to the South and became his own boss. When Buck saves him from thugs demanding to know the location of "The Thing," the old man invites Buck to take part in a game that could make him a very rich man, should he unravel the mystery successfully. Buck is soon on his way to Instanbul, where he encounters the beautiful and mysterious Yong (Vivian Hsu Re-hsuan) and even more people anxious to get their hands on "The Thing." Yong's lover is the wanted international fugitive "Mr. Zen" (Wu Hsin-kuo), who is also looking for "The Thing": a new and even deadlier form of Anthrax that was recently tested on some unsuspecting Turkish villagers. The dying old man had something to do with all of this and Buck's quest to get rich could end up costing him his life.