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?
Related documents: [0]  [DOC] American Gothic is a 1974 psychological horror novel by American writer Robert Bloch, a fictionalized portrayal of real life serial killer H. H. Holmes, who is renamed "G. Gordon Gregg" for the story. [END] 
[1]  [DOC] Herman Webster Mudgett (May 16, 1861 – May 7, 1896), better known under the name of Dr. Henry Howard Holmes or more commonly H. H. Holmes, was an American serial killer of the 19th century. [END] 
Answer: 
H. H. Holmes
H. H. Holmes