Thérèse Raquin.

Star-crossed lovers Thérèse and Laurent think they've gotten away with murder after Thérèse's weakling husband "falls" from a speeding train. But when forced to contend with a blackmailer's demands and the mute accusations of Thérèse's mother-in-law, it's only a matter of time before the law, their passion or blind chance trips them up.