Sixth part of Jerry Cotton movies. Agent Jerry Cotton infiltrates a big crime syndicate that is planning a major diamond heist.

Siegfried of Xanten snatches the Nibelung treasure from the king of the underworld and slays the dragon Fafnir, whose blood makes him invulnerable. Siegfried falls in love with Kriemhild, the sister of the Burgundian king. But only if Siegfried helps Gunther marry Brunhild will he be allowed to marry Kriemhild. He fulfills this condition, but the two women bring ruin upon Xanten and Burgundy...

Now Brunhild knows by which treason she was won for king Gunther of Burgund by Siegfried of Xanthen, and has been revenged by his foul murder by Hagen, more bloody revenge is inevitable. Hagen steals the Nibelungen-treasure to sink it in the stream and manages to kill Alberich and seize his invisibility-cap. Queen Kriemhild is packed of to an abbey so her son may grow up to become a prelate, but Hagen's men raid them and kill the child. She now accepts to become the wife of Etzel, king of the truly barbaric Hun nomads and invites the Burgund court nomenclature at their Danube court for their heir's baptism a few years later, but prepared a bloody conspiracy with her xenophobic brother-in-law behind her surprisingly chivalric husband's back, while Gunther accepts, hoping to avoid a far bloodier war, despite the danger for his party of knights, which materializes...

The ghost of a hanged man returns to fulfill his promise. All of his accusers must die!

A hooded serial killer finds a novel way to murder his victims--he lashes them to death with a whip. The police try to track him down before any more murders occur.

A strangler is loose on a British estate, and he not only strangles his victims but brands an "M" onto their foreheads before he decapitates them.

Both Scotland Yard and an amateur American sleuth are tracking a master criminal known as The Frog. This moniker refers to the bulging-eyed mask worn by the evildoer, and is reflected by the frog icons painfully tatooed onto the forearms of his henchmen. The trail leads to the country manor of an enigmatic, steely-eyed nabob, whose repressed son has eyes for the artistes at the Lolita cabaret, and whose lovely daughter captures the fancy of both the American playboy and the villain himself. Murder, kidnapping and seduction ensue.

In the Olden Tymes, Count Regula is drawn and quartered for killing twelve virgins in his dungeon torture chamber. Thirty-five years later, he comes back to seek revenge on the daughter of his intended thirteenth victim and the son of his prosecutor in order to attain immortal life.

Following a series of murders, it turns out that a notorious criminal believed to be dead is seeking revenge for his sister’s murder. Although the motive is obvious, the phantom cannot be apprehended because no one knows his identity. In desperation, one of the most experienced detectives is brought out of retirement.

On their wedding night, a newlywed couple find themselves menaced by a bloodthirsty vampire.