Colfer's tale of FBI secrecy and time travel in London is delightful, compelling and assured
Riley is no mere cipher of a hero and neither is Savano, his modern counterpart; both have engaging backstories, and throughout there is the sense of a writer who knows exactly what he's doing. Colfer's characters are compelling and well drawn, but they are also likable, and the book gallops to a conclusion that is satisfying and yet leaves us wanting more.
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The Guardian, Saturday 27 April 2013