Linc has lived all his short life on board the wheel-shaped ship. The generation vessel and its scientist cohort had been forcibly exiled from Earth many years earlier. But over time the machines have started to fail and the video messages from an all-knowing elder called Jerlet, just keep repeating commands, as though to children, not to touch the machines. Linc has fiddled with broken machines, despite the ban, and feels he can bring some of them back to life. This has become necessary as the garden machines, which are their food supply, are breaking down. Opposed to this “new” knowledge is Monel, a crippled and bitter rabble-rouser bent on power, and even the ship’s priestess, Magda. In a surprising turn Linc discovers that Jerlet is still alive and after Linc was self-exiled he finds Jerlet and is trained by him to use all the ship’s dormant or decaying systems. Ahead lies a yellow sun and their only hope of survival, the Earth-like planet Beryl. But some are fearful and sabotage looks to doom them all. Final book in Ben Bova’s Exile trilogy, and against all expectations it is a good finish. Can be read alone and is a quality entry in the dissipated generation starship sub-genre.