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Mister Monday (Keys to the Kingdom, Book 1) (original 2003; edition 2003)
by Garth Nix
Amazon.com Product Description (ISBN 0439551234, Mass Market Paperback)Seven days. Seven keys. Seven virtues. Seven sins. One mysterious house is the doorway to a very mysterious world -- where one boy is about to venture and unlock a number of fantastical secrets. This is another thrilling, triumphantly imaginative series from Garth Nix, the best-selling author of The Seventh Tower, Sabriel, and Lirael.
(retrieved from Amazon Fri, 12 Nov 2010 14:59:09 -0500)
Arthur Penhaligon is supposed to die at a young age, but is saved by a key that is shaped like the minute hand of a clock. The key causes bizarre creatures to come from another realm, bringing with them a plague. A man named Mister Monday will stop at nothing to get the key back. Arthur goes to a mysterious house that only he can see, so that he can learn the truth about himself and the key.
(summary from another edition)
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