This is a Cornell Woolrich story that was originally released under his pseudonym "William Irish." The story was adapted by Robert L. Richards. 

A man whose son was murdered in a tragic elevator crash a year before invites the survivors to dinner in hopes of exposing the killer. He says he knows who the killer is but can’t prove it, so poisoned that man’s dinner... and put the antidote on the table within reach of all of the guests. The killer has half an hour to reach for the antidote, and in doing so, will reveal his guilt. Will an innocent guest grab the antidote in case the host wrongly gave them the poison? Will the killer take the antidote and save their life but admit their guilt? Will the killer wait in case the host is bluffing? It’s a good, improbable story that is worth the listen just to see what happens.

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