Frankenstein unbound - Aldiss, Brian W. (Brian Wilson), 1925- (New York, Random House, 1974)
Joe Bodenland, a 21st century American, passes through a timeslip and finds himself with Byron and Shelley in the famous villa on the shore of Lake Geneva. More fantastically, he finds himself face to face with a real Frankenstein, a doppelganger inhabiting a complex world where fact and fiction may as easily have congress as Bodenland himself manages to make love to Mary Shelley. This title was made into a film, starring John Hurt, Raul Julia, Bridget Fonda, Jason Patric and Michael Hutchence
Keywords: Frankenstein's Monster -- (Fictitious character) -- Fiction; Time travel -- Fiction; Horror tales