THE GOTHIC NOVEL 3

What is the nickname of Alfred Hitchcock?
The nickname of Alfred Hitchcock is "The master of suspense". 

What was his most famous horror film?
"The Lady Vanishes" is his most famous film.

What was his main contribution to horror? 

His first contribution was The Sorrows of Satan. He made this first contribution in 1919. When his father died and he was twentty years old.