Aerimanders are extinct.

Or so the government would have you think, having centuries earlier destroyed the last of these deadly, dragon-like creatures.

So when wealthy twelve-year-old chemistry student Eva Alexander unwittingly purchases an aerimander egg, she becomes the target of the Thieves' Union and its newest member, thirteen-year-old orphan Dusty St. Ichabod.

But Eva is no easy mark, and soon she and Dusty are driven into a maze of sinister threats, betrayals and surprises - all while fighting to keep the egg away from power-hungry hands.

As the unlikely duo races against time, their fates - and that of the whole world - are at stake. Because there's one question no one dares to ask: What happens when the egg hatches?

Impossible Creatures meets The Mysterious Benedict Society in this New York Times Bestseller. This epic, fast-paced upper-middle grade fantasy is full of majestic creatures, heroic hijinks, battle-forged friendships, and sharp humour.