Ross conducts a little auto repair shop and is building himself a racing car, which is entered in the Corona race. Trumbull reads a description of "Speed King" in the papers, and wagers a large sum with Short that this unknown will "show in the money." Short proposes to Margery and is rejected. Margery's car refuses to start and Ross is phoned for to come and repair it. he meets Margery and while fixing her car they become friendly, he telling her of his racing ambition and of his despair because he has not money to complete his car. His visit makes quite an impression on Margery. She longs for another chat, so she unscrews an important part of her machine and tosses it away. Ross is again called to repair it. Again their conversation is most entertaining, so much so that Trumbull feels it his duty to cut it short, so he calls Margery to the house, where Short, who has been observing, is consumed with jealousy. Ross is loathe to leave, but as an excuse to return, he "forgets" his tools. Margery asks her father to lend the young man money to complete his car. Trumbull refuses. Margery tells him that the man has a chance in the race if he can complete his car; that his name is "Speed King." Trumbull is stumped. If he doesn't lend the money he will lose the bet to Short. Short solves the problem by telling Trumbull to lend the money conditionally and to have Ross sign a paper agreeing that if he cannot repay the amount after the race he will agree never to speak to Margery again. Trumbull takes the plan, as he has seen Ross return for his tools, and the very evident interest of his daughter for the young man. He broaches the subject to Ross, appeals to his "sporting" side, and Ross agrees. He accepts the loan and signs the paper. On the day of the race Short bribes the mechanician to cripple Ross's car at about the middle of the race. Margery overhears the plot and informs Ross. The latter changes mechanicians. Ross wins the race and incidentally the love of Margery.
—Moving Picture World synopsis