I'm afraid I was simply not convinced by Titus Alone. In fact, I was bored and confused by it. Titus, having run away from his home, finds himself in the neighbouring industrialised countryside (where people have never actually heard of Gormenghast, despite its absolute domination of its own hinterland). He becomes the object of obsession - in particular of the two women, Juno, with whom he has a love affair, and Cheeta, who rejects him and then develops a bizarrely elaborate plan to humiliate him by throwing a party at which various aspects of Gormenghast are satirically brought to life, but also of the self-appointed guardians from the Under-River. The imagery was intense, and I suppose it is in some way a spiritual and allegorical journey for Titus growing up, but in the end he ends back exactly where he started, and it did not work for me.
Also fails the Bechdel Test. I had hopes that the mysterious Black Rose would have a conversation with Juno, but she died before waking up.