Antonio S is a boy who knows all sorts of things. Scarrabo the Magnificent is a magician. Professor Kettering is a doctor. They live together at the top of a grand old house built long ago for a duke.

But who is Theodore Guzman, the secretive old man who lives downstairs? What mysterious things does he know? It takes someone like Antonio S to find out.

Odo Hirsch has written a wonderfully warm and eccentric story about a boy who explores a secret passage that leads to the very heart of the house where the magical world of Theodore Guzman comes to life.