MissMaryMorstancontactsSherlockHolmesforhishelpregardingherfather,captainMorstan,whodisappeared10yearsagoSincehisdisappearancesheannuallyreceivesavaluablepearlbypostfromanunknownpersonThemysteryleadsHolmesanddoctorWatsonintoanintricateplotregardingalosttreasurebelongingtofourconvictsontheAndamanIslands
展开
