| FARRELL | J. G. -; author who wrote the Empire Trilogy comprising Troubles, The Siege of Krishnapur and The Singapore Grip (7) |
| PERSEPOLIS | Which city was the ceremonial capital of the Persian Empire during the Achaemenid dynasty and the si |
| JGFARRELL | Novelist best known for his Empire Trilogy, two novels of which were awarded Booker Prizes (1,1,7) |
| KASDAN | Lawrence who co-wrote "The Empire Strikes Back" and "Return of the Jedi" |
| WELLS | H. G. -; author of The Time Machine, The Invisible Man, The War of the Worlds and the non-fiction A Short History of the World (5) |
| ROWLING | Author who wrote the Cormoran Strike trilogy comprising The Cuckoo's Calling, The Silkworm and Career of Evil under the pen name of Robert Galbraith (7) |
| MANTEL | Author of A Change of Climate and An Experiment in Love as well as the Cromwell trilogy comprising Wolf Hall, Bring Up the Bodies and The Mirror and the Light (6) |
| HOPE | Anthony -; author of the Ruritania trilogy comprising The Prisoner of Zenda, The Heart of Princess Osra and Rupert of Hentzau (4) |
| HARKNESS | Author of the All Souls trilogy comprising A Discovery of Witches and its sequels Shadow of Night and The Book of Life (8) |
| NARAYAN | Indian author of the trilogy comprising Swami and Friends, The Bachelor of Arts and The English Teacher (7) |
| DOBBS | Life peer, novelist and politician who penned the Francis Urquhart trilogy comprising House of Cards, To Play the King and The Final Cut (5) |
| LEWIS | C. S. -; novelist who wrote The Space Trilogy comprising Out of the Silent Planet, Perelandra and That Hideous Strength (5) |
| GRASS | Gunter -; author of the Danzig trilogy comprising The Tin Drum, Cat and Mouse and Dog Years (5) |
| BALLARD | J G -, author of novels Crash and The Drowned World |
| BELL | Author of the classic rural farm trilogy comprising Corduroy, Silver Ley and The Cherry Tree who also compiled some 5,000 crosswords (4) |
| SASSOON | Author and poet who penned a trilogy comprising Memoirs of a Fox Hunting Man, Memoirs of an Infantry Officer and Sherston's Progress (7) |
| RENAULT | Pen name of the novelist who wrote the Alexander Trilogy comprising Fire from Heaven, Persian Boy an |
| HARRIS | Novelist who wrote Fatherland and the Cicero trilogy comprising Imperium, Lustrum and Dictator (6) |
| GIBBON | Lewis Grassic -; Scottish author of the A Scots Quair trilogy comprising Sunset Song, Cloud Howe and Grey Granite (6) |
| OMEGA | Twenty-fourth and final letter of the Greek alphabet, used as the symbol for the SI unit of electrical resistance, the ohm (5) |
