A new chamber is about to be uncovered in the Pyramid of Khufu. Blake and Mortimer discover that an unusual villain, Colonel Olrik, is planning to steal the treasure it may contain. Black magic, crocodiles and an old guardian are the obstacles in the race for the sacred treasure.

A mysterious creature threatens the peace of London. It sees in the dark, isn't wounded by bullets, and wherever it goes, a yellow μ Greek pops up. Scientists kidnapped, Crown jewels stolen..... Only Blake and Mortimer can stop Dr. Septimus' vengeance. They discover that the mysterious creature is none other than Olrik, hypnotized!

A revolutionary amphibious aircraft, the Swordfish, invented by Professor Mortimer and piloted by Captain Blake, is coveted by Colonel Olrik, the Emperor's right-hand man... As the Emperor unleashes the Third World War, Olrik sets out to capture Professor Mortimer and seize the plans for his invention. With the help of Captain Blake, Mortimer succeeds, after many twists and turns, in having an armada of Swordfish built in great secrecy to destroy the Emperor's dreams of domination forever.