Bob Ho is a Chinese-American spy who decides to retire from his dangerous job to settle down with his girlfriend and her children. However, the children do not trust him and give him a hard time. His girlfriend, Gillian, is called away on a business trip, leaving Bob alone to take care of the kids.
During this time, Bob attempts to connect with the children by teaching them martial arts, cooking, and helping them with their personal problems. Meanwhile, one of the kids, Ian, accidentally downloads a top-secret formula from Bob's computer, which leads to a group of Russian terrorists led by Poldark, his old enemy, coming after them.
Bob must protect the family at all costs, using all his spy knowledge and martial arts skills to fend off Poldark's men. The children also play a crucial role in helping Bob, as they use their own unique skills and talents to fight back. In the end, Bob and the family emerge victorious, with a newfound respect and love for each other.