The Three Mesquiteers are forced to track down a train robbery ring after some of the gang hijack their truck for a getaway and the police conclude they are part of the gang, an identification which is just fine with the gang's nameless chief.
Two men are rivals for the same girl. When she finally agrees to marry one, the other--appearing to be magnanimous in defeat--presents his former rival with a beautiful German Shepherd dog as a wedding present. It turns out, however, that he had an ulterior motive--he had trained the pooch to allow...
Daredevil flyer David flirts with a waitress. An orphan accidentally takes off in a biplane requiring an aerial rescue. The villain reports a fake robbery and turns the orphan in to welfare workers, but a loyal dog saves the day.
A young man and his trusty dog go up against a gang of crooks that are building a dam out of shoddy materials, which could collapse and flood the entire valley.
