Gen is a thief who has been imprisoned in the King's dungeons for quite awhile after he stole the King's seal. He is suddenly pulled out of the dungeon to be sent on a quest with a few others to steal something of great importance, something that the King greatly wants, and something that they are relying on Gen to steal for them.
One of the best teen fiction books I have read. Though the story line is a big slow going until the end, the writing style is engaging and the main character is charming. Very enjoyable.