简介：ChiefInspectorJapp,afraidthathewillsoonfindhimselfunemployed,needsPoirot'sassistanceinsolvingastringofjewelrobberies.JappisunderintensepressuretocatchthethiefbutPoirotcounselspatience.Whenthejewelthiefstrikesagain,PoirotandCaptainHastingsgotothehomeofMarcusHardman,ajewelrycollectorfromwhomanemeraldnecklacewasstolen.PoirotisapparentlyquitetakenwiththeexiledRussianCountessVeraRossakoffandtoJapp'sgreatconsternation,dayspasswithnoprogressinthecase.Withthefamousdetectiveotherwiseoccupied,HastingsandMissLemondecidetoinvestigateontheirown.Poirothoweverknowswellwhothecriminalis.…