Green Lantern: Sleepers, Book 3 — Christopher J. Priest

The final volume in an epic trilogy, Sleepers, Book 3 features Hal Jordan, the most famous of Earth's modern-day Green Lanterns. Hal has been stripped of his powers, but it is up to him to fight the clones of the villain Sinestro, set loose by actions in the trilogy's first volume. In order to save the Earth, he may have to sacrifice himself by taking the Sinestro power rings on a one-way trip to the anti-matter universe.