The Poison Belt

A follow up to Arthur Conan Doyles well known novel, The Lost World, the Poison Belt is a short story set over a single 24 hour span of time.
On the Anniversary of their momentous trip to the Plateau, as depicted in The Lost World, the irascible Professor Challenger calls his companions to his home in Rochester with a curious directive: 'Bring Oxygen'.
What can it mean? Does it have anything to do with his dire warnings printed in the Times that morning? Can it truly be, as he says... The End of the World?
Written by Arthur Conan Doyle in 1913 and Narrated here by Michael Ward.