More than 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 catlike 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, the wild planet they tamed, the home they fought for, and the delicate alliance they share could be destroyed forever as a new threat looms. The Gringgs are not the first alien visitors to the planet, but they are the first to offer friendship--and a proposal for a prosperous future. But not everyone trusts the new guests. 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.

"An excellent read."--Locus

" McCaffrey and Nye] blend their skills effectively to produce a brisk, well-told...tale. Fans of either author, or both, will have fun."--Booklist