Some conmen convince financial journalist Brownley that leading financier Untermeyer is dead. His report throws the stock market into confusion, allowing the conmen to clear up on the markets. Brownley is then murdered.

An ex-con deported to Italy after serving a prison sentence in the U.S.A., has invited a group of protection racketeers to join him in Naples.

The body of a merchant seaman, reported lost overboard in the Mediterranean, is washed up on the south coast of England with a bullet in his head.

Duval investigates the disappearance of a valuable antibiotic somewhere between New York and the World Health Organization in Sweden.

Duval is on the trail of forger Eddie Keflik, who has blackmailed a clown in a traveling circus into working for him.

In Montreal for Interpol's annual conference, Duval catches up with a wanted man who escaped his clutches back in 1939.

Gangster Mike Marko amassed a fortune from the rackets, but did not live to spend it. Duval is on the trail of his right-hand man, Pavone.

Diamond dealer Jacob Moltz and his accomplice, girl magician Frankie Silver, devise a foolproof plan to rob the biggest diamond house in Amsterdam, and frame safe-cracker Sash Moran.

Insp. Duval is in pursuit of American financier Pearce Clyde, who is wanted for questioning by the U.S. Treasury. When he arrives at Clyde's hotel in the Himalayas, Duval sets off a booby-trap.

Lars Lukas, a French swimmer, is shot after completing a cross-Channel swim from France. It appears to be a motiveless murder until Duval hears a tape recording of Lukas's last words, a lead to a smuggling ring.

Duval flies to Delhi to locate a consignment of live cholera vaccine stolen from a laboratory in Karachi.

Duval goes to South America to pick up Dave Carson, who is wanted for murder. He walks into the middle of a revolution, and has to work side-by-side with his quarry.

Duval is called in after an assassination of an American diplomat. Evidence seems to point to a recently released Nazi seeking revenge. What does puzzle Duval is how he constructs the assassinations.