WhitneyCameronn(Cotten),amanwithastrongaffectionforhissister-in-law(Peters).Whenoneofherstepchildrendies,it'srevealedthatthechildwaspoisonedtodeath.Whitneysuspectshissister-in-lawcommittedthemurderandisafraidthatherothersonmaybeindanger.Thefilmclimaxesduringanoceanvoyageaboardacruiseship.
里卡尔多·斯卡马奇奥,马西米利亚诺·加洛,安娜贝拉·沃丽丝