The movie hits the usual beats in the final act: Armstrong disappears, the others think that he's Mr. Owen, Blore is killed, Vera and Lombard discover Amstrong's body, Vera and Lombard suspect each other. However, in this version, Blore is killed by a booby trap that Armstrong, had he been Mr. Owen, could have rigged well before his disappearance - there is no reason for Vera and Lombard to suspect each other once they discover Armstrong's body.