I guess that the one I'd pick at this point is "One Exciting Night."
Mary Roberts Rinehart's "The Bat" was an early book that helped me get hooked on mysteries. She had turned her earlier story "The Circular Staircase" into the Broadway play about the Bat.
Well, I got Staircase and a copy of The Bat plus all three versions of the movie. Unfortunately I found out about another movie version along the way. . . .
Surprise of surprises . . . D. W. Griffith did a bootleg version in 1922 called "One Exciting Night" which I finally got my hot little fists on a VHS tape of just a few years ago.
Side note: The hero is Henry Hull who played the Werewolf of London with Warner Oland in 1935. . . . You never know where a Chan connection will turn up!
