MissMaryMorstancontactsSherlockHolmesforhishelpregardingherfather,captainMorstan,whodisappeared10yearsago.Sincehisdisappearancesheannuallyreceivesavaluablepearlbypostfromanunknownperson.ThemysteryleadsHolmesanddoctorWatsonintoanintricateplotregardingalosttreasurebelongingtofourconvictsontheAndamanIs...
