Brian O'Conner, a young FBI agent is assigned to investigate a series of hijackings by going undercover with a high-way gang led by speed king Dominic Toretto. Managing in Toretto's world of gang conflict which is only solved in late-night car races, Brian starts to sympathize with his chief suspect and have true feelings for Toretto's younger sister Mia. At the end of the day, it all comes down to his decision where to dedicate his loyalty to.