In this prequel to the Ranger's Apprentice series, Halt and Crowley travel north seeking Prince Duncan's royal warrant to stop Morgrath from corrupting the Corps, but if they are to prevent a coup that is nearing success, the young Rangers will have to tread a dangerous path toward the annual tournament at Gorlan.

When twelve-year-olds Hannah and Maggie switch places, Hannah must prevent a famous art theft in 1905 and Maggie must cope with modern life until they can switch back.