MissMaryMorstancontactsSherlockHolmesforhishelpregardingherfather,captainMorstan,whodisappeared10yearsago.Sincehisdisappearancesheannuallyreceivesavaluablepearlbypostfromanunknownperson.ThemysteryleadsHolmesanddoctorWatsonintoanintricateplotregardingalosttreasurebelongingtofourconvictsontheAndamanIslands
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