Public Defender Gary Franklin, frustrated by being unable to save criminal Dutch Adams from a death sentence by blaming the slums environment as the cause of Dutch's crimes, enlists the aid of Dutch's sister, Marcia Adams, to get the slum dwellers at appeal for public monies to provide recreational places for the slum kids.

A kidnapping, three airplane crashes and several fist-fights adds speed to the plot in which the plans of a new, faster airplane motor invented by brothers Tim and Jerry are stolen and suspicion falls on their office secretary Mary Stuart. But she can pilot an airplane with the best of them and she risks her life to save Tim. And when she gets kidnapped, Jerry regains his lost nerve in rescuing her.

Motor patrolman Tim Conlon and his partner Bumps O'Neill vie for the attentions of Helen Regan, daughter of a fellow cop.

Canadian Mountie Mason is sent south of the border to look for a horse thief with only a watch chain for evidence. He befriends young Andy and when Calhoun hits Andy, Mason and Calhoun fight. In the scuffle Calhoun's watch with the missing chain is dislodged. Mason then sets out to bring in Calhoun and his gang.

In The Scarlet Brand, a young cowpoke tricked into rustling cattle and hell-bent on getting revenge against the poacher who set him up.

The cattle on the Langton Ranch are mysteriously dying and cowhands are disappearing or being shot. Two Langton riders bring a wounded rider they found wounded and hung up in a barbed-wire fence to Sally Langton and report that her father is missing. A lone rider, Jess Ryder, tops a rise and sees a band of men working on some calves in a secluded corral, and he frowns as he sees what Bat Murchinson is doing.

A gang of crooks kills a gold miner while trying to find out the location of the mine. They then terrorize the miner's son to get him to reveal the mine's location.