Exactlytwoyearsago,inBuenosAires,circumstancespreventedPoirotfrominvestigatingthesuddendeathofthebeautifulIrisRussell.Nowhehasthechancetotryagain,thistimeinLondon,whenayellowiris,mysteriouslyleftonhisdoorstep,alertsPoirotthatthekillermaystrikeoncemore.
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