With the trilogy, a fourth work, the novella Boy in Darkness, and a fifth, the fragment Titus Awakes, are often considered part of a larger "Gormenghast series".

Titus is exhausted by this stage and collapses on the city's waterfront, where he is rescued by a man named Muzzlehatch, who runs a zoo and drives a shark-shaped car.

He comes upon various huge glass and steel buildings, and arrives at a vast circular plaza of grey marble, which he begins to cross.

One of the flying machines starts to pursue Titus and he crosses the plaza hurriedly and runs into a large building to escape.

He watches the party, overhearing various strange and disjointed conversations, until by accident he breaks the skylight, and falls through onto the ground.

Muzzlehatch and Titus then bring the Black Rose out of the Under-River region to Juno's house to recover from her abuse.

Despite him being a stalker of some kind, Juno takes up with the mysterious man, whom she decides to call "Anchor" (he will not tell her his real name).

Titus resumes his wanderings and is eventually found in a state of fever by a woman named Cheeta, who nurses him back to health.

Titus lusts for her because he has spent all his life in a straitlaced medieval castle, and Cheeta lives like science incarnate.

When Titus first sees the factory from a distance it looks sleek and impressive, but as he gets closer he notices that it gives off a strange unnerving hum, and a sickly sweet smell of death.

She contrives an elaborate plan to lure him into the "Black House", to see "a hundred bright inventions", and end their relationship on a high note.

Muzzlehatch has arrived at the Black House in order to confront Cheeta's father, the scientist, for his role in the murder of his animals.

He reveals that he has sabotaged Cheeta's father's factory, and a few moments later it is destroyed in a huge explosion that rocks the Black House and covers the sky in a filthy orange cloud.

Hearing the guns of Gormenghast saluting the missing Earl, he is confirmed in his knowledge that he is not insane and that the Castle exists.

Crabcalf, Slingshott and Crack-Bell: Inhabitants of the Under-River region of tunnels and halls under the city's river, where refugees from various prison camps and persecutions gather to evade capture.

Furthermore, even though her factory is efficient, sleek and modern, there are indications that it may be an allegory for the Nazi concentration camps Peake encountered during his service in the Second World War.

As David Louis Edelman notes, the prescient Steerpike never seems to be able to accomplish much either, except to drive Titus' father mad by burning his library.