FBI Agent Ma Gang (Martin Lawrence Martin Lawrence) is pleased to learn that his stepson Trent (Brandon T Jackson Brandon T. Jackson) has just been admitted to Duke University. However, Trent had no interest in further studies and only wanted to sign a recording contract. As a minor, he had no choice but to turn to Ma Gang for help. Ma Gang certainly disagreed, and he was busy with an important case. In order to track down a member of the Russian gang, one of Ma Gang's informants died during the mission, and the memory drive containing important information was also missing. The only clue is that a copy of the drive was hidden in the Georgia Girls' Art School. On the other hand, Trent, who was unwilling to give up, decided to continue to fight for him to sign the contract during Ma Gang's mission. However, when their identity was exposed by an emergency, Ma Gang had to use his specialty again, pretending to be Shirley's grandmother and Trent as his big niece. At this point, a good undercover show full of jokes and excitement was staged. This film is a sequel to the American crime comedy "Fat Mom undercover".