The third book in Clarke's beloved Space Odyssey series, 2061: Odyssey Three returns to Heywood Floyd, survivor of two previous encounters with the mysterious monoliths and the alien intelligences behind them. Floyd is chosen as one of a handful of celebrity guests to witness the first manned touchdown on the surface of Halley's Comet on the privately-owned spaceship Universe.

But the touchdown is not fated to go as planned. On Jupiter's moon Europa, which has undergone a transformation after events at the end of 2010: Odyssey Two, scientists have spotted the sudden growth of a gigantic, asymmetrical mountain determined to be one single enormous diamond-a fragment of Jupiter's core. The Universe's sister ship, Galaxy, is hijacked and forced to crash into Europa's ocean-and the Universe is diverted from its original mission to rescue the crew.

In this book, Heywood Floyd must once again survive an encounter with HAL, David Bowman, and the mysterious monolith-building race with its own hidden agenda-that will shape the destiny of the human race.