Dragon Lad: Wand of the Black Sphere:

Dirk is a budding boy wizard who hatched as a dragon and has a ring that turns him back into one. For his summer vacation, he's leaving Roman Britannia on a secret journey to tell the dragon who raised him she's free from a curse.

He doesn't realize he's being tracked by his worst enemy, the sorceress who abducted him as a baby and blames him for her husband's death. Treacherous Ethelda thinks Dirk has her fiendishly powerful wand and she'll do anything to get it back. The Roman Army wants the Wand of the Black Sphere, too, worried Ethelda will use it against them, and they are looking for Dirk, the last one seen with it. But Dirk's halfway around the world dealing with monsters and magic they couldn't imagine.

Packed with intrigue and humor, this final book in the illustrated Dragon Lad trilogy joins The Thirteenth Egg and Tale of the Talisman for spectacular storytelling.