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.

With his family away for their annual summer holiday, Richard Sherman decides he has the opportunity to live a bachelor’s life. The beautiful but ditzy blonde from the apartment above catches his eye and they soon start spending time together – maybe a little too much time!