The star Mira was unpredictably variable. Sometimes it was blazing, brilliant and hot. Other times it was oddly dim, cool, shedding little warmth on its many planets. Gresth Gkae, leader of the Mirans, was seeking a better star, one to which his "people" could migrate. That star had to be steady, reliable, with a good planetary system. And in his astronomical searching, he found Sol. With hundreds of ships, each larger than whole Terrestrial spaceports, and traveling faster than the speed of light, the Mirans set out to move in to Solar regions and take over. And on Earth there was nothing which would be capable of beating off this incredible armada-until Buck Kendall stumbled upon THE ULTIMATE WEAPON.

A rip-roaring space adventure from the 1930's by the legendary John Cambpell. A race in another solar system many light years away from Earth is looking for some solar system with a sun more stable than their highly erratic one. They discover our nice neat little system and decide to move. With faster than light drive and much more advanced science and weapons it looks like a walk over by the away team. But they make the mistake of showing their hand just a bit too soon to earth's most amazing genius and inventor. The fight is on and it is bloody but our hero, using desperate means and a lot of uncertainty finally develops the ultimate weapon, And not a second too soon. Listen and enjoy this early SF story. - Summary by phil chenevert