What's better than a tale of twin poisonings like we had in our last episode? Twin tales of twin poisonings, of course. This short story is substantially similar to Sparkling Cyanide, which we just covered, but it actually came first, and as a precursor to that novel it also has some fascinating differences. Journey with us not only to New York but--in the Suchet adaptation--to Argentina too as we explore all that this Poirot story has to offer.