Twelve-year-old Grubb lives a hand-to-mouth existence in Victorian England, working as a chimney sweep under a cruel master.

After an incident at an inn, he hides in the trunk of one of its guests, the enigmatic Alistair Grim, and is whisked away to his Odditorium, a wonderful flying house full of incredible mechanical features powered by an enigmatic substance called animus.

Now apprenticed to Grim, Grubb begins to settle into his new life and find a new family in the eccentric crew of the Odditorium, when suddenly his new world comes under attack by the evil Prince Nightshade and he is propelled into a perilous quest.

As he gets caught up in the struggle, Grubb will learn valuable lessons and discover remarkable secrets about himself and his new host.