Captain Blake murdered at the Athens airport, Olrik seems to have won the first round. Mad of rage, Mortimer swears that he will never cease to avenge his friend. He starts hunting, but the tracks are rare. Cheik Abdel Razek, an old man with mysterious powers, warns him against the entourage of Dr Grossgrabenstein, a wealthy Egyptology enthusiast who undertook excavations not far from the Great Pyramid. Sharkey, the construction manager hired by the doctor, is a well-known brute. Twice Mortime Mortimer intervenes in favour of Abdel Razek that Sharkey was preparing to correct of importance, thus attracting the sympathy of the noble old man. The repeated warnings of the latter have not ceased to awaken the curiosity of Mortimer. Strange events occur on the excavations, some of which seem to be supernatural. In fact, Mortimer will sometimes feel like losing foot in this investigation that will lead him into the depths of the Great Pyramide, and will often turn into discovery.