AllMovie

In this WWII drama, James Mason plays naval commander Richard Heritage, who is distracted from his duties by a beautiful young woman who is secretly in cahoots with Nazi spies. By accident, Heritage lets her discover the sailing dates of American warships. The mistake costs the U.S. Navy a war ship and costs Heritage his post. After his court-martial, he sets off to find the girl who tripped him up and discovers that she has been killed. With the help of Laura Verity (Joyce Howard), he uncovers the Nazi spy ring, which is being operated under the guise of a British theatrical agency in the seaside town of Blackpool. The head of the outfit is master spy Christopher Child (Tom Walls), a fearsome villain. Heritage hopes to redeem himself and win the heart of Laura by defeating Child and his schemes.