Titus Alone* by Mervyn Peake, is the third in the Gormenghast series.**
This is one of the most highly regarded of fantasy world constructions, while at the same time one of the least appreciated. Personally, I think this is because most, possibly all, of the printed version of the books are big and heavy with tiny type. And, there’s not been a movie. Regarding the first problem, that is solved by there being a Kindle version, and now is your chance to stock up the third of the three for super cheap, two bucks, but only for a day or two.
- see associates note below
** Not a trilogy, though there are three of them. Peake died while writing the fourth in the series, leaving only three, and thus leading many to believe that this is a trilogy.
There might not be a movie, but there is a well-regarded BBC adaptation of the first two books into a four-part miniseries.