Following the excitement of first Bangkok and then New York, a big murder case takes place in Tokyo. Chinatown master detectives Tangren (Wang Baoqiang) and Qinfeng (Liu Haoren) are invited to take up the mystery. Adding to the excitement are the other detectives on the CRIMASTER international detective list as well as the current top rank, Q. Yet another hilarious battle of wits is set to take place...
The plot spans nearly 30 years and tells the story of a poor boy from the northeast, "Xiao Bao", who follows his village's hairdresser, "Er Ge" (Sha Yi), to Shenzhen, a special zone. The two are forced to take care of the baby, and then they meet up with a cold-hearted young woman named Ma Lu (Ma Li).
Driven by the desire for the huge reward, Tang Ren (by Wang Baoqiang) tricked Qin Feng (by Liu Haoran) to New York, to attend the World Detective Contest,. Later on, behind the crazy competition, Qin and Tang discovered the real hidden facts of this contest.
After the unexpected death of his best friend, a man examines his life and finds it incredibly lonely. Inspired by an encounter with a beautiful and sexy model, he embarks with his three friends on what turns out to be a crazy (and slightly stupid) endeavor on a path towards fulfillment.