Both the Irish Times (in a supplement on Children's Books for Christmas) and the Sunday Independent have recommended Edda for Christmas reading. The Independent says (after I corrected their spelling):
Conor Kostick's Edda (O'Brien Press, €9.99) is the third fantasy in Kostick's series based on gaming and virtual worlds. In spite of the science fiction/futuristic challenges, at its heart are good-hearted clever teenagers confronting danger and oppression in an exciting series of adventures. Continuity is created with the earlier novels in the series, in the form of characters who we know and like, while at the same time there is inventiveness, especially in the figure of Penelope who is physically on a life-support system but whose avatar is free to roam worlds. Kostick challenges the young reader intellectually, but the heart is always in the right place too. This book would work equally well for younger and older teenagers.