Guy Thorne was the pen name of Cyril Arthur Edward Ranger Gull, who was an English writer and author who lived from 1875 to 1923 and wrote many books. His most famous work is When It Was Dark: The Story of a Great Conspiracy (1903). He wrote as Leonard Cresswell Ingleby and C. Ranger Gull as well. Thorne went to Denstone College, Manchester Grammar, and Oxford University, but he didn't finish his education there. From 1897 to 1898, he worked as a writer for the Saturday Review. He also wrote for The Bookman and The Academy. In 1899, he was editor of London Life. After that, he worked for the Daily Mail and then the Daily Express. He also wrote for Society, a news magazine. His first book, The Hypocrite: A Novel of Oxford and London Life, came out in 1898 under an assumed name. Starting in 1900, he wrote fiction, and over the next few decades, he wrote about 125 books. When It Was Dark was the most well-known and sold 500,000 copies. The book tells the story of Constantine Schaube, a traitorous Jew who tried to take down all of Christianity by falsely denying the Resurrection.