Led by its female mayor, a neutral town on the Arkansas-Missouri border during the Civil War attempts to stay peaceful. A newcomer looking for her brother is pulled into the town’s violence.

A young man just released from a reformatory moves to a new neighborhood with his sister, intending to start a new life. However, he gets mixed up with the local mob boss and corrupt politicians and soon finds himself being framed for an arson and murder he didn't commit.

When Barry Corvall discovers that his new bride is a possible enemy agent, he resigns from the diplomatic service to go undercover to route out an espionage ring planning to destroy American industrial capability.

Terry is the chief car tester for Emery Motors and Frank is an Engineer. Jane has just been hired to work in publicity. Frank and Terry both want Jane to be their girl. Terry has designed a new carburetor that should bring him fame and money, but he cannot get it to work correctly. Terry and Gadget have tested it for over a year, but it still is not perfected. Emery Motors assigns Frank to help Terry with the carburetor, but Terry is not happy because Frank is an Engineer and is also vying for Jane. They finish the carburetor, and to test it, they enter a car in the Indianapolis 500 race. Terry is not yet satisfied with the carburetor before the big race even though it has passed all the tests.