Nobody understood how or why. No one knew where they came from. And few seemed to feel it was likely we would ever find out.

Until now, no one had seen a cloud change course and glide into a planetary system. No one had seen a city under attack.

It was fortunate nobody lived on Moonlight. The inhabitants had obviously been overwhelmed by the ice age brought on by the instability of their sun. Best estimates were that there’d been no one there for about two thousand years.

COLLINGDALE HAD GROWN up in Boston with an alcoholic mother and a missing father, who, his mother insisted until the day of her sodden teary death, had gone west on business and would be back any day. He’d spent two years in an orphanage, been adopted by a pair of religious fanatics, run away so many times they’d eventually implanted a tracker, and—despite everything—won a scholarship from the University of Massachusetts. He’d taken a degree in archeology, taken private flying lessons on a whim, and, as he liked to think of it, never again touched ground. Eventually he’d decided that flights between Chicago and Boston were too confining. He’d learned to pilot the superluminals, had taken the command seat for several major corporations and the Academy, had gotten bored hauling people and supplies back and forth through the void, gone back to school, and specialized in a discipline that, at that time, lacked subject matter: xenology.

In the meantime he’d attended the funerals of both his foster parents, who’d died a year apart, the one unable to live without the other. They’d refused longevity treatments on the grounds they were not God’s plan. They’d never given up on him, even though they disapproved of the directions his life had taken. He’d stopped going home during the last years of their lives because they kept telling him they forgave him and were sure God would as well.