Author Rick Riordan Published by Puffin ISBN 9780141346847 EAN 9780141346847 Bic Code Y Cover Paperback
Percy Jackson – the son of Poseidon – has had an unnervingly quiet school year. But then he discovers that the magical borders protecting Half Blood Hill, a summer camp dedicated to training young demi-gods, are failing. Unless something is done, the camp will be attacked by demons and monsters.
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