In L'Onde Septimus, the threat of an extraterrestrial device, called Orpheus, had been thwarted by Olrik's sacrifice. Since then, the "Colonel" has been living in a psychiatric asylum. While Philip Mortimer tries to bring back his old adversary to reason, using the famous formula of the Sheik Abdel Razek ("By Horus, remains!"), he learns that there is another Orpheus. On board a cargo ship transformed into a secret laboratory, Mortimer discovers this strange pilot of this machine coming from elsewhere: an alien with a human form, dark and hieratic, to which the scientists have given the name of "Moloch", the biblical divinity. But the reactions of this Moloch, and the hieroglyphs that he leaves behind him like so many indecipherable messages, make fear the worst. This time again, the British capital is in danger. Unless Olrik again plays the heroes... With L'Onde Septimus 2, Jean Dufaux put a straight-up to the work of Christ's work, and heed-up to a scene with a character.