Fire Time (Doubleday science fiction)

In this classic science fiction adventure, a fiery doomsday threatens an alien world - and the human colonists who have made it their home. Firetime is coming to Ishtar. This once-in-a-millennium event occurs when one of the planet's three suns encroaches on Ishtar's surface, to disastrous effect. The nightmare rapidly approaching, barbaric tribes have declared war on their more civilized brethren in hopes of avoiding a natural extermination. Standing between the opposing forces are the colonists who settled on Ishtar after abandoning their home planet, Earth. But in this time of chaos and destruction, there is little the humans can do to aid their Ishtarian allies in the desperate fight for survival. The Terran powers, engaged in their own terrible conflict with a hostile alien race, will offer no help to the endangered planet. With a fiery doomsday on the way, the humans can do nothing but watch and wait - and pray for a miracle that will forestall the inevitable apocalypse. A stunning work of speculative invention from one of the all-time masters of science fiction and fantasy, Poul Anderson's classic Fire Time is a richly imagined tale of war, alien contact, and environmental catastrophe that brilliantly questions the concepts of right and wrong, good and evil, and heroism and villainy.