Over twenty-five years ago, the first humans came to the unspoiled planet of Doona. They ignored one important fact: They were not alone. Doona was the home of the cat-like alien race of Hrrubans. And so began an experiment in cohabitation that lasted for a quarter of a century. Their contract is now up for renewal. Now, their delicate alliance is threatened by new alien visitors offering friendship. But not everyone believes in their motives. And as a battle of diplomatic unrest ensues, Doona once again falls under the dark shadow of uncertainty and self-destruction.