http://libremdb.catsarch.i2p/title/tt0069281
My parents saw "Sleuth" on Broadway, during its original run, just a year or so before this film was released. Watching the movie I can see how it would make a good play, but by the same token, it is not a translation that feels slow, or wordy, or unsuited to the screen. The adaptation is excellent, without "opening up" the play too much.