Twilight of Reason — Jonathan Burke

They had been working for a long time to send a ship out into space, but when the great day came it was essential that the ship should be destroyed. They had looked ambitiously at the Moon and at the planets and stars beyond. Now they stared up in fear...

Here is the record of the first onslaught of a strange disease that dropped on mankind from the skies. It is the story of an alien plague that worked too swiftly to be counteracted by human science - a plague that did not so much drive men out of their minds as steal the minds from them.