Secret agent Matt Helm must battle foreign spies and a rogue nation's exiled ruler in order to recover a hijacked U.S. government experimental flying saucer.
Gold bullion worth USD 1 billion has been stolen from a hijacked train in Denmark. The main suspect is Count Massimo Contini. The US government sends Matt Helm, one of its top agents, to investigate and recover the gold.
A former secret agent gives up the spy business to become a private investigator with an eye for women and a fast car, in the employ of a beautiful blond attorney who is also a lover.