The Gormenghast trilogy was one of the most unusual cult cycles of the 20th-century. In this surreal, darkly comic fantasy telling the story of Titus, 77th Earl of Groan, Mervyn Peake created a vivid world with strong characters enveloped in intrigue and fearful intent. Here are the three novels completed by Peake, and a fourth, a completion of a fragment left at his early death in 1968. Rupert Degas, an astonishingly versatile...