Square Deal Sanderson is in pursuit of a horse thief, but someone else shoots the varmint before Sanderson can offer him a "square deal."

The Hollywood Post's sports writer, Jimmy Jones (Charles Quigley), yearns to be a crime reporter, and thus looks for foul play on even the most routine assignments. In writing a piece about a girl's softball team, Jimmy discovers that their sponsor, Foy Harris (John Gallaudet), is a notorious racketeer who has supposedly gone straight. Jimmy suspects Foy is still up to no good. He begins hanging around the team to do a bit of snooping, and also to be near the cute new pitcher, Ann Casey (Jacqueline Wells).

Former crook 'Square' Kelly serves in the First World War. When he returns from the war, one of his comrades-in-arms convinces him to join the police force. But Kelly finds himself confronting the very criminals who made up his old gang.