There are plenty of suspects when an unscrupulous, blackmailing businessman turns up dead, especially the Police Commissioner's current paramour, who actually confessed to the killing before it was committed.
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Rendezvous at Midnight (1935) is a mystery movie. Starring Ralph Bellamy, Valerie Hobson, Catherine Doucet. Rated 10.0/10 on TMDB. Watch it online free on ZapFlix.