The people of Earth have colonised
Venus, despite the intelligent species native to the planet, who are treated as inferiors with no rights (reminiscent of
apartheid and
Jim Crow laws on Earth). One of the Venusians shows his Earthman friend the ruins of an ancient city, where they discover details of an ancient
weapon, apparently abandoned millennia before as being too dreadful to actually use. However, as the domination by the colonists increases, elements of the Venusian resistance obtain the weapon and use it on the colonial cities and their population. The weapon works by disconnecting the brain from the mind, and within a short time, the Venusians take back control of their planet from the defenseless colonists. Earth surrenders and signs a peace treaty with Venus. The Venusians then destroy the weapon. ==Story notes==