"Attention, Inner-Flight ship Attention You are ordered to land at the Control Station on Deimos for inspection. Attention You are to land at once " The metallic rasp of the speaker echoed through the corridors of the great ship. The passengers glanced at each other uneasily, murmuring and peering out the port windows at the small speck below, the dot of rock that was the Martian checkpoint, Deimos. "What's up?" an anxious passenger asked one of the pilots, hurrying through the ship to check the escape lock. "We have to land. Keep seated." The pilot went on. "Land? But why?" They all looked at each other. Hovering above the bulging Inner-Flight ship were three slender Martian pursuit craft, poised and alert for any emergency. As the Inner-Flight ship prepared to land the pursuit ships dropped lower, carefully maintaining themselves a short distance away.