What is an interesting book by Eoin Colfer?

Other than his popular series (The Artemis Fowl series), he has written the books:

Airman, The Supernaturals, Half Moon Investigations, The Wish List, The Legends of Spud Murphy, The Legend of the Worst Boy in the World, The Legend of Captain Crows Teeth, Benny and Omar, and Benny and Babe.