“Quintessence is an utterly stunning work of imagination, a slipstream counterhistory set in a fourteenth century that is as audaciously imagined as any work of science fiction.” —Rosemary Edghill, coauthor of The Shadow of Albion

“With Quintessence David Walton proves that winning the Philip K. Dick Award was not a fluke, but a harbinger of things to come.” —Mike Resnick, Hugo and Nebula Award–winning author of the Oracle Trilogy