'World-conquering'
- The Guardian
'The first volume of a new series by author and illustrator of the How to Train Your Dragon series is an event....Funny, thoughtful and surprisingly wise and lively, this is another coup from Cowell'
- The Sunday Times
'The detail of Cowell's world is a delight...This one will run and run.'
- The Observer
'... sustain a sense of wonder and mayhem from start to finish. Cowell skillfully mixes adventure with silliness in a satisfying story for younger fantasy fans.
- Publishers Weekly
'... it is by turns grim, poignant, philosophical and terrifying, woven through with Cowell's slapstick humour.'
- The Times Literary Supplement
'An exciting and promising start... A fantastical adventure ensues, filled with mythical beasts, cliff-hangers and an epic struggle between good and evil'
- The Scotsman