[1] After an electric "buzzing" device is found near his winning horse Turnabout, jockey Muggs McGinnis is questioned by track officials.

Embittered, Muggs is about to quit racing forever when he and his gang of friends, The East Side Kids, learn that Mrs. Nora Brown, whom they call "Ma," is about to lose her stable because of an unpaid feed bill.

Having won several races with her prize horse Storm Cloud, Ma is now solvent and able to reclaim Alice and to offer the gang jobs.

Davis, however, orders thugs Joe English and Mike Hanlin to kill Gaby and drug Storm Cloud, the only horse he believes is capable of beating Turnabout in the handicap.

When Davis hears the news, he sends Hanlin and English to finish the job on Gaby, and the thugs arrive at the hospital at the same time as Muggs and the gang.