The Mark III Hyperspace Beacon was the earliest type of beacon ever built -- by Earth, no less. It was located on one of the Proxima Centauri planets, and it wasn't working. This was one of those jobs when being an interstellar trouble-shooter wouldn't have been so bad -- if he could have shot the trouble! A classic science fiction tale from the author of the "Stainless Steel Rat," "Bill the Galactic Hero," and "Eden" series!