A land mine is stolen from a U.S. atomic testing lab in the Nevada desert. Steve hops on the next train out of the nearest town, believing the thief is escaping on board the Snowbird.
Steve is send back to Paris, this time serving as bodyguard to a young French woman who was witness to a murder, until he can turn her over to the police.
Steve takes a train to Mexico in pursuit of killers who have discovered the whereabouts of Hapsburg art treasures stolen by the Nazis.
Steve travels to Macao to learn who is spreading counterfeit money through the area.
Steve goes to the Far East to the island state of Singapore in search of a woman who can tell him the location of a million dollars worth of stolen rubber.
The Italian journalist Lorenzo has found out that the American mafia is financially supporting the Italian mafia in its terror campaign during the present election.
In a country in the Middle East the king is assassinated by a secret organization on behalf of a neighboring country.
U S agent Steve Mitchell crosses the Iron Curtain to assist Walter Norton, a U S attache, who has valuable information to escape back to the United States.
Steve travels to West Morocco to identify and stop saboteurs at a base being built.
Steve exposes South American country's plot against the US.
When a vital part of a U.S. code machine is stolen, Steve is sent to Venice, Italy, to locate it and buy it back before its secrets end up in enemy hands.
After the war a lot of orphaned teenagers are drifting about in Berlin. Some of them have formed a gang of young criminals, who cover their faces with black hoods.
In the subterranean passages of a ruined castle in Transjordan, built by the Crusaders in 1140, US agent Johnny Marshall has found a statuette of a goddess.
Steve negotiates the dangerous back alleys of Havana in search of a spy in possession of stolen documents on microfilm.
A political informer's murder in Rome leads to the discovery that an unknown opportunist is impersonating Steve.
