Question: What is the name of the American serial killer of the 19th century on which the 1974 psychological horror novel by Robert Bloch is based?
Facts:
American Gothic (novel) is a 1974 psychological horror novel
American Gothic (novel) is a fictionalized portrayal of real life serial killer H. H. Holmes
H. H. Holmes was an American serial killer of the 19th century
Answer: H. H. Holmes