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 own 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.