Dad Brooks is in financial trouble and needs to sell a lot of horses. But they are being rustled and needing help, he sends for Tom. Tom looks for the rustlers but eventually realizes that someone is using a wild horse to do the rustling. He finds the secret entrance used by the rustlers to hide the horses but soon finds himself a prisoner.
Unfortunately the movie Ridin' Thru is not yet available on HBO Max.
| Writing | Carol Shandrew | Story |
| Writing | Rose Gordon | Screenplay |
| Writing | Carl Krusada | Dialogue |
| Directing | Harry S. Webb | Director |