First published in 2001, Eoin Colfer’s action-fantasy series of adventures centring around tweenage criminal mastermind Artemis Fowl (Jr) may at first glance appear to be little more than an attempt to cash-in on the then white-hot and unquestioned success of J K Rowling’s “Harry Potter” series but in reality the books hewed much closer to the world of Guillermo del Toro’s “Hellboy”, with a dash…