Two admissions before I begin.
First, and most obviously, Mervyn Peake's 1946 novel, Titus Groan, cannot, by any reasonable judgment, be called a work of pulp fantasy. Certainly it's a fantasy and a remarkable one at that, but it's quite far from the sort one would have found in the pages of Weird Tales. Nevertheless, because of its relevance to matters near and dear to fantasy RPGs like Dungeons & Dragons, I hope I can be forgiven for this taxonomical impropriety (a sin I've committed on more than one occasion previously).
Second, despite numerous entreaties by people whose opinions I respect, I hadn't read Titus Groan or its two sequels in the Gormenghast Trilogy until quite recently, an omission that, having now corrected, I feel was a terrible lacuna in my literary education. Please bear that in mind, as you read this post, as what follows are the fervid thoughts of a neophyte experiencing a rare delicacy for a first time rather than the carefully considered opinions of someone well-versed in its unique pleasures.
Titus Groan begins with the birth of its titular character, the only son of Lord Sepulchrave, 76th Earl of Groan, who will one day inherit rulership of Castle Gormenghast. City-like in size, Castle Gormenghast is effectively a world unto itself, to the point that all the novel's action takes place within its vast expanse. The castle is so large that characters who dwell in different parts of it occasionally remark that it's been years since they last saw one another. Filled with innumerable sub-buildings, chambers, and hiding places, many of which have evocative names – the Tower of Flints and the Hall of Bright Carvings being but two that feature in the novel – the castle is almost a character in its own right. It's certainly more than just the setting of the story: characters make frequent references to the castle and "the stones" (or variations thereof) in their oaths and exclamations, reinforcing its centrality to the unfolding story. Castle Gormenghast is truly a singular literary creation and I now understand why so many people have recommended I read Titus Groan over the years.
Contemporaneous with the birth of Titus are events in the far-off – and insufferably hot – Kitchens, overseen by a cruel chef called Swelter. (As an aside, the names in Titus Groan are terrific: reminiscent of Dickens in their dark whimsy and portentous of the natures of those who bear them.) Among Swelter's many abused minions is a teenaged boy named Steerpike, who wishes nothing more than to leave his service and find escape. This he does during the commotion caused by the celebration of the birth of Titus. Unfortunately, he is soon discovered by Mr Flay, Lord Sepulchrave's majordomo, who consigns him to a locked room for, among other things, not knowing his proper place. Mr Flay is quite keen on such matters, as Castle Gormenghast depends on everyone who dwells within it – and there are seemingly a great many of them – knowing his place and acting in accordance with it. Even Lord Sepulchrave himself is bound by his duties, which consist in large part of performing rituals dictated by the books of the Master of Ceremonies, rituals passed down from previous Earls of Groan and added to as circumstances demand. It's a ponderous, hidebound system and one can't help but be a little sympathetic to characters who wish to see it ended, one way or another.
Steerpike is one such character and much of the book focuses on him, as he uses his natural charm and cleverness to work his way up the ladder of Castle Gormenghast's internal hierarchy. He escapes from the confinement into which Mr Flay flung him through a window and then scrambles across the rooftops of Gormenghast. While doing so, he spies Lady Fuschia, the teenaged sister of newborn Titus and decides to endear himself to her as a means of bettering his position. This he does through a combination of flattery and genuine friendship, appealing to her loneliness and romantic yearnings for a more exciting life. In fairly short order, he uses her to secure himself a job with the court physician, Dr Prunesqualor, but his goals are much, much higher and the bulk of the novel concerns the rise in fortune that results from them – as well as the chaos he unleashes on the previously staid world of Castle Gormenghast.
Titus Groan is, at times, a mildly confusing book whose narrative demands attention to follow, which is why I'm uncertain I've understood all the details. There are a large number of characters and locales within Gormenghast, in addition to references and allusions that give the book a fevered, dream-like quality. This is simultaneously commendable and infuriating, as the very elements that make Titus Groan so compelling sometimes work against immediate comprehension (or at least they did in my case). Admittedly, the same could be said of, say, The Lord of the Rings, another great work of English fantasy that appeared a few years later. Titus Groan is thus a book one might need to read a couple of times before fully appreciating but that should prove little chore, given the richness and imagination of Peake's prose. It's a pleasure to read and I look forward to doing so again when time permits.
Though named for the young heir to the throne, who spends much of the book a child, the real stars of Titus Groan are Steerpike and Castle Gormenghast itself. The former is a charming rogue who, as the story progresses, becomes increasingly black hearted and outright villainous. Peake is to be praised for his ability to lure the reader into initial sympathy with the downtrodden young man, even as he slowly reveals the true depths of his wickedness. Gormenghast, meanwhile, could be called the greatest literary example of a megadungeon, despite being almost entirely aboveground. Nevertheless, it's hard not to imagine what it would be like to wander the twisting halls of this immense structure and uncover its secrets. It's in this context that I think Titus Groan and its sequels are perhaps of most immediate interest to roleplayers and, on that basis, alone I highly recommend it, though it offers a great deal more, if you're willing to stick with it.
