Space is big. Properly big. The galaxy is around one hundred thousand light years from side to side, so if you can't travel faster than light, and your lifespan is three-score years and ten . . . well you do the maths. Fortunately there's another way. Scattered around the galaxy are a network of ancient wormholes that allow you to travel from one planet to another in a single step. Unfortunately, these Tubeways through space are strictly controlled...