"Toi le Venin" is Robert Hossein's masterpiece,and one of the great thrillers of the fifties.Based on a Frederic Dard novel,a writer the director often worked with (see also "le Monte-Charge" which Hossein did not direct but in which he was the lead too),the screenplay grabs you from the first pictures on a desert road by night where a beautiful blonde might be the fieriest of the criminals to the mysterious house where he finds his femme fatale ..and her sister.Then begins a cat and mouse play .One of the sisters is in a wheelchair .But is she really disabled?Which one is the criminal who tried to kill the hero on that night? The two actresses,Marina Vlady and the late Odile Versois were sisters.Turn off all the lights before watching.Highly suspenseful.