A secret agent is summoned by the head of a counter espionage organization, to Trieste where he is to unmask a potential enemy operating in Venice.

Italy during the Napoleonic wars: A French General and his Adjutant are separated from their unit get beyond the enemy lines. There they meet Carlotta the resolute daughter of an Italian Count, who cannot withstand the charm of the French.

American FBI agent Lemmy Caution arrives in France to track down a dangerous spy.

FBI Agent Lemmy Caution is sent after a missing two million in Casablanca while mob boss mistress Carlotta plays both sides of the law.

Géo Paquet, aka The Gorilla, breaks from jail. Now an escaped convict, the elite agent must infiltrate a dangerous gang working for a foreign embassy as their leader, a spy enjoying diplomatic immunity, can't be arrested by regular police.