Christopher Reynolds, an American flying with the R.A.F, is shot down over German-occupied Holland and is given shelter by a Dutch family. Posing as the insane husband of the daughter of the house, Anita Wolverman, Reynolds convinces the German officer quartered there, Major Zellfritz, with the necessity for her divorce decree to be granted. After the court-hearing, Anita, goes to manage a home for retired ladies and, persuaded by Reynolds, tries to gain military information from the German Officer. When her former husband escapes from the insane-asylum his exploits are blamed on Reynolds. With the help of the old ladies and Anita, who "remarries" him, Reynolds escapes to England in a stolen German airplane.

Calvin Drake employs a group of low-lifes to drive away land owners along the path of a new railroad; Red Ryder opposes this strategy.

The nefarious Dr. Fu Manchu searches for the keys to the tomb of Genghis Khan, in order to fulfill a prophecy that will enable him to conquer the world. His nemesi, Dr. Nayland Smith and his associates fight to keep the evil doctor from getting his hands on the keys. In 1943 the serial was edited together into a feature movie also called Drums of Fu Manchu.