On a mysterious ring world called Halo, humanity's struggle for survival has reached a critical point. But the fierce warriors of the Covenant, the most powerful fighters of the alien race, are not the only danger that awaits people here. When the Reach fortress and its brave defenders were defeated, only the crew of the only cruiser under the command of Captain Keyes, a team of paratroopers, and the last survivor managed to escape death Spartan - super-soldier Master Chief. Master Chief, while landing on Halo, suffers an accident in territory occupied by the Covenant, where alien fighters are looking for something created by a long-vanished race. The Halo holds many deadly secrets, but one of them eclipses all others. Master Chief forces the scattered armies of people to frantically uncover the darkest secret of the ring world - and unleashes an uncontrollable force...