The Daily Clarion hires detective story writer Steve Colt to investigate the deaths of a group of scientists working on an atomic rocket development project.
Prior to the United States' involvement in World War II, the masked vigilante Spy Smasher fights Nazi agents operating within the US, led by the treacherous sabotage leader codenamed The Mask.
The war lords of a potential enemy of the US has the spy ring, led by John Baroda, the Spy King and his aide Nitra, sabotaging the plans for a vast defense system of radar stations along the American borders.
A newly hired police chief vows to clean up a notoriously corrupt police department. When he is murdered, investigators find that there is no shortage of suspects, most of them being fellow cops.
Confederate Col. Lafe Harvey (Earl Ross) travels home after the Civil War, where he must tell his niece, Betty (Frances Grant), that her father is presumed dead.
Chet Kasedon is after the Indians hidden gold mine but Chief Moya will not reveal it's location. He has also hired mining engineers Gale and Mortimer to locate the mine.
Joyce Reid, a wealthy young debutante, stows away on a cargo ship to China, carrying as passengers her dashing aviator sweetheart, Dan Bailey and and her munitions-producing father, E.
Someone is murdering the cast and crew of a new Hollywood movie, and the leading lady may be next. As a police detective locks down the lot and refuses to let anyone leave, the studio’s publicity head and his secretary attempt to solve the murders themselves.