SIR MORTIMER HUNTER IS THE NEW FOREIGN SECRETARY AND SIDNEY OREBAR TAKES HIS PLACE AS HEAD OF SECRET SERVICE.HE HIRES CROW.AT THE SAME TIME, PROFESSOR GIORGIU OFFERS TO THE MAHDI THE USE OF A NEW WEAPON, THE ARIETE, CONTROLLED BY REMOTE CONTROL.THEY STEAL THE TREASURE OF THE FIRST KHEDIVE AND ATTACK A BRITISH PATROL NEAR THE BORDER.TO FACE THE NEW MENACE, SIDNEY OREBAR WITH MOIRA HUNTER AND FIELD AGENT AMELIA STAR GO TO EGYPT WITH PROFESSOR HARRIS, IN HIS FLYING MACHINE, THE VICTORIA.MARION SHUSTER AND VON KULOV FROM THE GERMAN SECRET SERVICE ARE, ALSO THERE, AFTER GIORGIU, WHO IS, A GERMAN CITIZEN, WHO STOLE THE BLUEPRINT OF ARIETE IN GERMANY.A GREAT ADVENTURE BEGINS.