Mike Gabrieli's brother Tom has always had one talent: getting into trouble. But this time, Tom has disappeared after mysteriously gaining possession of a priceless Aztec artifact. Mike sets out to find him, never suspecting that he is about to be shuttled back and forth in time, and between alternate universes. The descendants of the Incas have a plan to keep Pizarro and his conquistidors from overthrowing their ancestors' empire. In spite of Mike's sympathy for their cause, he faces the possibility that, instead of creating an alternate world with the Incas ascendant, he may be wiping out the world he was born into - and himself along with it! In addition to Fred Saberhagen's novel, "The Mask of the Sun", seven top writers have contributed stories set in the same universe. The contributors include "New York Times" bestselling authors David Weber and Harry Turtledove, as well as Walter Jon Williams, John Maddox Roberts, Jane Lindskold, and more, expanding on Fred Saberhagen's concept and bringing their own perspectives to this volume of exciting alternate universe adventure.