The Poison Belt by Arthur Conan Doyle follows Professor Challenger and his friends as they confront a catastrophic cosmic event. Earth passes through a "poison belt" of ether, which contaminates the atmosphere, seemingly dooming all life. The group seals themselves in a room with an oxygen supply, awaiting humanity’s end. This speculative sci-fi novella explores themes of human frailty, survival, and the value of life in the face of universal forces, showcasing Doyle's early 20th-century imagination.