Duke Mallor (Don Terry) is an independent taxicab driver who after being double-crossed and framed by Eddie Hawkins (Ward Bond), cab-driver for the city's biggest taxicab fleet, serves prison time for manslaughter. After being released from prison, he gathers together the other independent drivers and sets out to ruin Hawkins who is now superintendent of the big fleet. He also finds time to romance Ellen Ames (Rosalind Keith), a hospital nurse.