At least 30, possibly 40, of Edgar Wallace's books were made into movies.
There was a marvellous, unintentionally funny movie made of the old E Phillips Oppenheim warhorse The Great Impersonation. The movie was set specifically in 1914, just before ww1 - but the movie, which was made in the 1930s, had everyone in 1930s fashions buzzing about in latest model 1930s cars.
And of course all the big novels of our Public Domain period:
The Four Feathers, A E W Mason
Beau Geste
Dracula
Frankenstein
Several by Jules Verne
Several by H G Wells
Several by Louis Lamour
Quite a few from books by Elmore Leonard including western 3.10 to Yuma. (at least twice)
Giant by Edna Ferber
Showboat ditto
Green For Death, an excellent little b+w movie set in a WW2 hospital in which a man dug out of a bombsite after an air raid is murdered. From an equally excellent and wryly funny novel.
Several of Thorne Smith's fantasies.
Topper
Topper Takes a Trip
Turnabout (movies under other names, with variations. it's the one where a people swap places in someone else's body - mother/daughter, or husband/wife.
Daddy Long Legs, by Jean Webster.
and hundreds and hundreds more. Many, of course, were made under different titles, for some obscure reason.
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