Fire Time Author:Poul Anderson This book is about what happens on a planet with three suns (the main sun, a dwarf sun, and a wandering sun) when the wandering sun comes too close. On this planet, called Ishtar, humans and the indigenous centauroid aliens co-exist. "Firetime" is coming, as it does at one thousand year intervals. Civilization has always collapsed at these times... more », due in large part to the barbarian Ishtarians whose lands are the hardest hit when the rogue sun comes around. They leave their baked homelands and go rampaging into the more "civilized" lands elsewhere on the planet. This time around, humans are here and they want to stop civilization from being destroyed again.