When an Italian journalist is murdered on board an international flight, Steve must identify the killer and protect the only person left who knows which American is financing a Mafia vote-fraud operation in Italy.
Steve goes to the Middle East to prove that the U.S. was not responsible for an Arab king's assassination, but to do so he has to find the real killer.
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.
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.
Steve parachutes into an Eastern European country to search for a confession that will exonerate the country's leader of false charges of being a spy for the U.S.
The recent murder of a man who was supposed to have died six years ago sends Steve to Greece in search of a cast-iron swastika supposedly containing the location of Hitler's secret bank accounts.
In Paris, Steve tries to determine who has set a time bomb to disrupt an important secret conference between the U.S. and three countries of Eastern Europe.
Steve goes to Stockholm, Sweden, to determine which member of an organization of lecturers is ferrying U.S. secrets to foreign spies, but to do so he must rescue an informant's kidnapped child.