There are 4 books in the Gormenghast Trilogy series. The newest book is Titus Awakes which came out in 2011.

The first volume of the GORMENGHAST trilogy of fantasy novels. Titus Groan is born the heir to Gormenghast castle, and finds himself in a world predetermined by complex rituals that have been made obscure by the passage of time. Along the corridors of the castle, the child encounters some of…
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Enter the world of Gormenghast...the vast crumbling castle to which the seventy-seventh Earl, Titus Groan, is Lord and heir. Gothic labyrinth of roofs and turrets, cloisters and corridors, stairwells and dungeons, it is also the cobwebbed kingdom of Byzantine government and age-old rituals, a world primed to implode beneath the…

3
Titus Alone

Titus Alone
In this final part of the trilogy, we follow Titus, now almost twenty, as he escapes from the Castle, flees its oppressive Ritual, and becomes lost in a sandstorm. Helped by the owner of a travelling zoo, Muzzlehatch, and his ex-lover Juno, Titus ends up stranded in a big, bustling…

4
Titus Awakes

By Maeve Gilmore, Mervyn Peake ,

Book cover of Titus Awakes

In Titus Awakes the 77th Earl of Groan leaves the crumbling castle of Gormenghast and finds the larger world even stranger than his birthplace. Confronted by elemental and human threats - snowstorms, shipwrecks and attempts on his life - Titus' bravery is tested and he must fight to free himself…