The rebuilding of Mestiko is starting to make progress: the atmosphere is partially restored, and Federation scientists are introducing new methods of replenishing the planet's biosphere. But their efforts are being stymied by the growing power of the mar-Atyya, who shun all offworlders. The arrival of the Starship Enterprise under the command of James T. Kirk proves less than fortuitous, as the ship becomes a flashpoint for all of Mestiko's troubles. Now Raya elMora, the leader of the planetary council, finds herself facing exile--which could spell doom for Mestiko...