MurdochandInspectorBrackenreidareaboardtheSSKeewatinaftertheowner,ClarenceMacFarlane,receiveswhathebelievesisathreat.TheKeewatinisabouttodepartfromTorontoonitsmaidenvoyagedestinedforRochester,N.Y.andMurdochthinkstheyshouldstayonboard,especiallyafterheseesthatJuliaisoneoftheinvitedguests.TheirpresenceprovesusefulafterMacFarlane'sdaughterAmy,whoisengagedtoherfather'schieffinancialofficerOwenMathers,fallsoverboardandisnowheretobefound.AsMurdochinvestigateshefindsthereisarealthreatagainsttheKeewatinandthetruefactsbehindAmy'sdisappearance.