Pat O'Farrell, a rich young man, takes a job as a truck-driver for his uncle's milk company, and falls in love with Cliare Knight, daughter of the Knight Car Company. Pat is financing "Dad" Perkins, who is working on a super-charger which Pat hopes to put on the Knight race-cars. Perkins tells Pat he has loaned the invention to lawyer Stanton Wade. Lawyer Wade has intention of keeping the device for his own benefit. Pat has no intentions of allowing that to happen.