John Varley's monumental trilogy--Titan, Wizard, and Demon--has achieved cult status, hailed as a modern triumph of the imagination by critics and fans.

It begins with humankind's exploration of a massive satellite orbiting Saturn. It culminates in a shocking discovery: the satellite is a giant alien being. Her name is Gaea. Her awesome interior is mind-boggling--because it is a mind. A mind that calls out to explorers...and transforms all who enter.