Bullet Brain

During WW2, a Royal Navy Commander stumbles upon a murdered woman and discovers a network of Nazi spies and Fifth-Columnists.

Theo has had many boyfriends who wanted to marry her. Since her mother, Mrs. Selworth, has been married many times, Theo is unsure of commitment. Without much thought, she finally accepts the proposal of Air Corps Lieutenant Tom West. After the honeymoon, Tom's father dies and Tom goes into the defense industry. When Theo has a baby, she hates the idea of being matronly and wants to be the old party girl. The problem is that her husband is working constantly. She looks to her friends, who are having their own problems, and to her old flame Captain Lancing. To decide on what she wants to do with her baby and her life, Theo must grow up.

Kay Murdock (Lynn Bari) strolls into the Dixie Bar in Shanghai on November 1, 1941 and asks the bartender for a letter addressed to Captain Larsen, and is referred to Roy Bonnell (Preston Foster), the manager of this combination bar and gambling house. He refuses to turn the letter over to her and she steals it. Bonnell later recovers the letter which contains a coded note. Kay reveals she is an agent of the British Secret Service. Bonnell, a fugitive from American justice, says he will turn over the note to the highest bidder. When he approaches the Japanese, they seize him but he escapes, after learing that the note was part of an alarm for Japanese fifth columnists everywhere after the attack on Pearl Harbor that has just been set in motion.

Reporter Dallas Dayle and FBI agent Bob Grayson hunt an escaped German agent.

Reporter Hela Martinic returns home from Australia to wartime Zagreb, only to find herself investigating the mysterious death of an old friend, Vera Kralj.

Germans kidnap an American major and try to convince him that World War II is over, so that they can get details about the Allied invasion of Europe out of him.