Orville "Gabby" Denton drifts from job to job, gambling away most of his earnings, but is loved by his sister Nancy Evans and nephew Buddy and gets work as a mechanic at his brother-in-law Beef Evans' Metropolitan Garage. Unknown to Gabby, the entire garage is run by Jenkins, whose specialty is stolen cars. Beef, who is otherwise honest, works for Jenkins, but does not realize that the true head man is "The Dummy," a deaf-mute who pretends to be Jenkins' butler. One day, Gabby is sent to pick up Silver, Jenkins's girl friend, whose car has broken down. Both Gabby and Silver are wisecrackers and take to each other immediately, after which Silver dumps Jenkins. When The Dummy gets an order for a high-priced sedan, he sends his thugs to steal it. During the race to evade the police, the driver hits Buddy, who is driving across the street in his miniature toy car. The driver continues on to the garage, where the stolen car is immediately repainted. Buddy survives his surgery. A friend of Gabby who saw the accident describes the car, and Gabby realizes this is the same car that roared into the garage to the paint shop. He investigates and discovers a piece of Buddy's little car in the wheel of the stolen car. When he tells Beef of his discovery, Beef gets drunk and confronts Jenkins and The Dummy. They kill Beef, then try to make his death look accidental. Bill Jones, a photographer friend of Gabby, provides Gabby with a photograph of Beef behind the wheel of a car before the accident, which proves Beef was dead before he crashed. Silver helps Gabby in his fight against Jenkins. When the lights go out, The Dummy and Jenkins escape in a car, but collide with another car coming up the ramp of the garage and plunge down an elevator shaft. With the theft ring cracked, Silver and Gabby marry.