Olrik finds refuge in the Chinese establishment of Lilly Sing, where injects himself with morphine to forget his tormented past with Septimus.

In the Centaur Club, Captain Francis Blake of MI5 is warned by his deputy Millovitch from the Home Office that a madman is wandering around King's Cross station.

Mortimer returns to his laboratory and Nasir tells him about the disturbing shape that he saw emerging underneath the machine: he saw Septimus' spectrum coming out of the Telecephaloscope.

Blake decides to explore the basement of the abandoned warehouse near King's Cross in search of the machine, in which he discovers metal door.

Blake approaches the glass column and sees a scuba diver attached to the spaceship-like craft with wires and tubes staring back at him.

At the same moment, Mortimer takes a taxi to Lady Rowana, who invited him to attend a private party that included Septimus' four admirers.

The professor makes the assumption that there is another mega wave generator that stimulated the Telecephaloscope, and that the image of Septimus, kept in memory, intends to replicate indefinitely.

At 10 Downing Street, the Prime Minister tells Blake that the mysterious craft, Orpheus, was discovered by Major Banks' team during the last war and that its existence is to be kept a secret in order to facilitate a study by scientists.

A few days later, Blake and Mortimer discuss their adventure, while Olrik (who has not recovered from his experience) finds himself interned in Bedlam Hospice with Major Blanks and his team.

[2] For the newspaper Nice-Matin, The Septimus Wave is overall a very good album,[3] but Le Huffington Post finds it at a much lower level compared to The Yellow "M".

[4] In January 2016, during an interview with journalist Yann Blake, Jean Dufaux announced that a sequel to this album had been written and will soon see the light of day: "Normally the Wave Septimus was planned in two volumes".

[5] The album titled Le Cri du Moloch (in French) and illustrated by Christian Cailleaux and Étienne Schréder is finally published on November 20, 2020.