"Based on the bestselling video game for XBOX."

"2552. Having barely escaped the final battle for Reach against the vast alien alliance known as the Covenant, the crew of the Pillar of Autumn, including Spartan John-117--the Master Chief--and his AI companion Cortana, is forced to make a desperate escape into slipspace. But their destination brings them to an ancient mystery and an even greater struggle. In this far-flung corner of the universe floats a magnificently massive, artificial ringworld. The crew's only hope of survival is to crash-land on its surface and take the battle opposing the Covenant to the ground"--Back cover