Marc Vitrac was born in Louisiana in the early 1960's, about the time the first interplanetary probes delivered the news that Mars and Venus were teeming with life—even human life. At that point, the "Space Race" became the central preoccupation of the great powers of the world.

Now, in 1988, Marc has been assigned to Jamestown, the US-Commonwealth base on Venus, near the great Venusian city of Kartahown. Set in a countryside swarming with sabertooths and dinosaurs, Jamestown is home to a small band of American and allied scientist-adventurers.