The Sphinx

A string of murders has witnesses giving identical descriptions of a man seen leaving each scene — Jerome Breen, a wealthy philanthropist who has been deaf and mute since birth and could not possibly have been overheard. Lionel Atwill plays Breen in a Monogram old-dark-house mystery directed by Phil Rosen, with Sheila Terry as the reporter convinced there is more to the suspect than his affliction suggests, and Paul Hurst as the detective working the case. The solution, when it comes, is a genuinely nasty piece of pre-Code plotting. Made the same year Atwill headlined Mystery of the Wax Museum, it shows why he was the era's go-to man for quiet menace. The film is in the public domain.