old scene british? mystery

Saw movie scene on tv in early 60s 9possibly late 50s). It as black and white.  It was a mystery set in a large building (in the scene i saw). Seems british in my mind, but could be usa.  Movie probably from 30s or 40s.  Bunch of well dressed people in a large house/mansion.  Obviously a mystery.  Much discussion then move to a cave to explore (looking for evidence i think). One character, a man, notices a chain on ground.  Movie  shows chain being drug away, but not who pulls it.  Man later notices chain is gone. tells no one.  I get called to dinner and never see any more of the movie.  H!as bugged me ever since.

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