A young thief is drawn into a life of magic and adventure after picking the pocket of the powerful wizard Nevery Flinglas, who has returned from exile to attempt to reverse the troubling decline of magic in Wellmet City.

In an alternate 1914 Europe, fifteen-year-old Austrian Prince Alek, on the run from the Clanker Powers who are attempting to take over the globe using mechanical machinery, forms an uneasy alliance with Deryn who, disguised as a boy to join the British Air Service, is learning to fly genetically-engineered beasts.

From his 1776 Pennsylvania homestead, thirteen-year-old Samuel, who is a highly-skilled woodsman, sets out toward New York City to rescue his parents from the band of British soldiers and Indians who kidnapped them after slaughtering most of their community. Includes historical notes at the end of each chapter.