Commando Captain Craig Killian, carrying important military information, is wounded and taken to a hospital on the South Coast of England, operated by Doctor Joseph Wolf. The hospital is really a blind used by Nazi spies working on wrecking the Home Defense of England. In order to discredit the information that Killian has, Wolf tells an important British official that Killian is suffering from shock and is not responsible for what he says. Killian escapes and is on his way to warn the authorities, but the spies get there ahead of him and commit a series of crimes, implicating Killian.