Treaty at Doona — Anne McCaffrey; Jody Lynn Nye

For the good of the planet?
Or the destruction of an alliance?

Several years after resolving a crisis of treachery on Doona, the Humans and Hrrubans encounter a new threat to their peaceful coexistence ... The Gringgs are not the first alien visitors to Doona, but they are the first to offer friendship--and a proposal to partake in a trade agreement being drawn up by Doona's leaders. Some are willing to trust the Gringgs; others question their true motives...and a battle of diplomatic unrest ensues.

With Doona's military forces at the ready, the planet once again falls under the dark shadow of uncertainty--and self-destruction...