The Fall of Hyperion by Dan Simmons

The Fall of Hyperion by Dan Simmons is the second book in the Hyperion Cantos series, published in 1990. It is a science fiction novel that continues the story begun in Hyperion, exploring themes of time travel, artificial intelligence, and human existence. The book follows a group of characters as they navigate a complex web of events on the planet Hyperion, where mysterious Time Tombs are opening, revealing secrets that threaten to change the course of history.