TheAldensarespendingsunnydaysattheshoreandsummernightsinamobilehomerightonthebeach!Onemorning,Bennyfindsagoldnecklaceinthesand.Soonasearchforitsownerbegins,andatrailofcluesleadsthechildrentoTowerHouse.WhatwilltheBoxcarChildrenfindinthestrangeoldmansion?