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When the police narrow in on the Dan Kirk auto theft gang, Kirk moves the gang to the quiet midwestern town of Belmont. Meanwhile, in Belmont, Mary Kane and her spinster aunt, Martha, try to convince Mary's father, "Pop" Kane, to stay in bed and rest his lumbago. Kane asks Mary to go to Mr. Whitmore, the bank manager, and ask for clemency in paying back his loan in light of his illness, which she does before leaving for a ride with Whitmore's son, Ted. As Whitmore tells Mary that her father need not worry for a month or so, Sam Jones, previously of Belmont, returns to the town, defeated by bad luck. Mary has not seen Sam in a long time and is overjoyed, while Ted becomes jealous and, in an attempt to pull her away from Sam, knocks her off balance. Sam punches Ted and is taken to jail by Brady, the motorcycle cop. Mary helps to have Sam released from jail, and when she sees him hitchhiking, she offers him a job at her father's gas station as her father is bedridden. When a company truck driver tells Sam about a sales contest that offers a grand prize of a trip for two to Chicago, Sam enters the station in the contest. Sam refers to the book he had been reading in jail, "Psychology of Sales," and discovers ways to improve the station's productivity. As Sam teaches Elmer, the station attendant, his newly-learned sales tactics, Elmer spies his nemesis, Henry, making a run for the restroom. As usual, Henry, who is not a paying customer, makes it to the restroom before Elmer can catch him. Across the street from the station, Kirk has opened a competing station, which is actually a front for altering stolen cars. After giving Sam a list of stolen cars and asking him to keep his eye open, Brady goes to Kirk, now known as "Benson," to do the same. At the Kirk station, they sell crankcase drainings instead of oil to Ted, who is driving his father's car. When Whitmore realizes that his car has been ruined, Ted lies and says that he bought the bad oil from Sam. Mary follows Ted to the Kirk station and guesses that that is where he bought the oil. The two are jumped by the Kirk gang, and Kirk attempts to kidnap Mary and is watched by Sam, Elmer, and policemen in a stakeout car. The police chase them and catch Kirk and his gang, who are then arrested. Days later, Sam is in second place in the contest when Henry drives up in his new car. Elmer sells him new tires, which puts the station in first place. The station wins the grand prize, and Sam and Mary enjoy their honeymoon in Chicago.