Thief! is a short story written by Megan Whalen Turner. It was originally published in Disney Adventures in August 2000 and contains illustrations by Chad Cameron. It has not been collected in any other volumes.
Featuring a younger Eugenides at ten-years-old, Gen wants to follow in the footsteps of his grandfather, the King's Thief, to the chagrin of the rest of his family who hopes he will become a soldier instead. Adamantly refusing to change his mind, Gen finds that practicing his skills winds up causing more trouble than he expected.