Steve Mitchell (Brian Donlevy) goes to Greece to find the Iron Banner, on which is a list of secret Nazi bank accounts.
Steve exposes South American country's plot against the US.
Steve is sent to Paris to protect a man named Szabo, and more importantly, the papers in Szabo's briefcase.
In a small country in South America the leader of the minority party is killed three days before the election. A US citizen, living in the country, is accused of the murder. The US government thinks this is just a frame, made up to put the majority party and their ally, USA, in an unfavourable light, thus rising the chances for the minority party to win the election. US special agent Steve Mitchell is sent down there to find out how it is.
A Civil War map has been stolen by a foreign agent and Steve has been sent to investigate.
Steve's assignment is to find a missing diplomat, who is believed to be traveling in Barcelona, Spain.
Steve Mitchell is sent to Cairo to track and catch the Order of the Secret Dove. This secret society, with both Arab and European members, is terrorizing the whole Middle East. It is a powder-magazine, which can explode the unstable, political situation in the region. A Greek has some information about the secret order, which he is willing to give Steve on certain conditions.
Steve travels to Tokyo to get evidence on an ex-girlfriend who's suspected in an outbreak of sabotage. He finds Marta as charming and dangerous as ever; an agent and a soldier who figured her out soon join her husband in death. Once Steve accuses her of sabotage and murder, he's in line to be her next victim.
After a famed foreign correspondent is murdered Steve travels to Burma to locate his missing companion Linya. There he navigates an unusual group of world's citizens and escapes several attempts on his life.
A foreign agent loses his life trying to steal a reel of film from a low-budget Italian movie. Steve is sent to Rome to find out why this footage is so valuable. He meets the flick's untalented producer, director and screenwriter and screens the film. Steve can't figure out why anyone would want this pretentious collection of shots. Then, the cameraman staggers in with a knife in his back.
Steve hops on a French train to protect the head of an American plastics corporation who's traveling to a foreign conference. He finds the industrialist shot dead and missing are the man's documents detailing a new discovery in weapons. With the help of a French businessman, Steve goes undercover among the passengers looking for a suspect.
Steve is sent to India to meet with a man named Guda regarding Carter who was possibly framed for stirring up a revolt.
Steve is smuggled into an Eastern European labor camp to get intelligence from a one-time Communist bigwig. Passing himself off as one of the uranium miners, Steve gets in and contacts his informer. He runs into unexpected trouble getting out however, as the workers have sabotaged one of the mine shafts to explode.
The Commissioner ships Special Agent Steve Mitchell off to the Swiss Alps to recover a document that proves the death of a foreign leader was no accident.
Steve is sent to Stockholm, Sweden, to investigate a group of European professors who go conduct worldwide lecture tours. One of them is though to be a foreign agent carrying secrets back with him or her. An informant asks Steve to retrieve his son from a boarding school there, but finds the child has disappeared.
The Commissioner sends Steve to Munich Germany to crack and espionage ring that transmits secret information by word of mouth in order to avoid leaving a paper trail.
Steve Mitchell is sent to Casablanca to find and stop those responsible for trying to sabotage the relocation of European refugees to their own island in the Mediterranean.
Steve Mitchell is sent to the South China Seas to assume the identity of the mysterious Captain Jaeger with the mission of breaking up a huge gun-running operation.