Draconis Academy 3: Oblivination (A Nocturnal Academy Story) - Draconis Academy, #3

One fine winter's morning, the inhabitants of the small country town of Tumult awake to discover that they have all been the victims of identity theft. No one can remember who they are. Meanwhile, Drago is rejoicing in his new, stronger form and showing off to his classmates. He can even stand up to the Tooth and Claw Master in a fight. He feels invincible. Thus, when he mysteriously disappears, his friends are baffled.
Who is powerful enough to abduct a dragon?Florence, Colin, Olive, Auberia and Derrick follow Drago's trail to a mysterious new club in town, full of elemental traps and puzzles they must defeat to find their friend. But the club's mysterious owner isn't going to make things easy for them. An acquaintance of Professor Abbacus from the Circus Infinitus days, he has a fiendish plan to remake the world.