Espionage novel. Conrad's other novel of this same kind is "The Secret Agent." According to Wikipedia: "Joseph Conrad (1857 – 1924) was a Polish-born English novelist. Many critics regard him as one of the greatest novelists in the English language—a fact that is remarkable, as he did not learn to speak English fluently until he was in his twenties (and always with a strong Polish accent). He became a naturalized British subject in 1886. Conrad is recognized as a master prose stylist. Some of his works have a strain of romanticism, but more importantly he is recognized as an important forerunner of modernist literature. His narrative style and anti-heroic characters have influenced many writers, including Ernest Hemingway, D. H. Lawrence, F. Scott Fitzgerald, Graham Greene, William S. Burroughs, Joseph Heller, V.S. Naipaul, Italo Calvino and J. M. Coetzee."