Jerry McGill, an Arizona cowpuncher, arrives in Los Angeles, is robbed by a stranger in a taxi, and is stranded. He is befriended by Frankie, a newsboy, who buys his dinner and becomes his pal. Jerry joins the police force as a mounted policeman and, while patrolling a wealthy residential district, thwarts a holdup perpetrated on heiress Virginia Selby by her companion, Count Mirski, who has hired two crooks. To Frankie's sorrow, Jerry and Virginia become fast friends. She invites Jerry to a dinner party, where the count plots to rob the Selby safe; but when Virginia interrupts the crooks she is kidnapped. Jerry, warned by Frankie's dog, pursues the crooks in a car; when ditched, he follows on a motorcycle and subdues the count and his men. Virginia's father invites Jerry to his ranch, and he is united with Virginia.