Mike-764's summation is obviously that of an updated US presentation & not that of the original short story originally set in the '20s by one of Britain's most popular & prolific spinner of yarns with a twist,W W Jacobs.Through the 30s-50s it was a popular choice for Rep groups and BBC Radio and rates with the best - the famed "Sorry,Wrong No!" as a suspencer for the imagination. Small wonder it was a popular choice for the US "Suspense" series. Adaptations from the 50s for film & TV have altered the "McGuffin" but not always for the best. I probably saw this particular version but not recently, so I can't properly rate it. I have,however,read the play & it is that with which I am familiar. Listen to this in the dark in the original version with the original finish which is the real clincher. Who - or what was knocking at the door after that final wish? Would you have opened it?