WhitneyCameronn(Cotten),amanwithastrongaffectionforhissister-in-law(Peters).Whenoneofherstepchildrendies,it'srevealedthatthechildwaspoisonedtodeath.Whitneysuspectshissister-in-lawcommittedthemurderandisafraidthatherothersonmaybeindanger.Thefilmclimaxesduringanoceanvoyageaboardacruiseship
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