Earth's Last Citadel

This novel was first published in 1943 in the magazine Argosy and in book form it was published first in 1964.

Torn from the Twentieth Century by the super-science of a master being from an alien galaxy, four adventurers find themselves at Carcasilla, EARTH'S LAST CITADEL, a billion years from now. It is there that the mutated remains of humanity are making their final stand.