The Fall of Hyperion

Seven people are sent to Hyperion on a 'pilgrimage' that is almost certainly a suicide mission. The Ousters, a segment of humanity evolving differently after centuries spent in deep space, are about to invade the Hegemony of Man. The artificial intelligence of the Core that humanity depends on for predictions of future events and management of the farcaster system can't tell what's coming with an unknown like the Shrike and Hyperion in play. Battles rage across space and time as varying parties maneuver and betray each other. Meanwhile the pilgrims on Hyperion struggle to survive and finally uncover the secrets of the Shrike.