Garth Nix
2) Sir Thursday
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When Arthur is drafted into the Glorious Army of the Architect by Sir Thursday, he must survive basic training, avoid getting posted to the Front, and figure out how to free Part Four of the Will, while Leaf tries to banish Arthur's doppleganger on Earth.
4) Grim Tuesday
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Seventh-grader Arthur Penhaligon returns to the parallel universe known as the House to fight his latest enemy, Grim Tuesday, whose greed threatens to destroy both the House and the Earth.
5) Lady Friday
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Young Arthur Penhaligon must weigh an offer from Lady Friday that is either a cunning trap for the Rightful Heir or a golden opportunity that he must seize.
6) Blood ties
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As the Conquerors try to destroy Erdas, Meilin -- fed up with waiting and ready to fight -- sets off into enemy territory with her spirit animal, a panda named Jhi. Her friends Conor and Abeke aren't far behind ... but they're not the only ones.
8) Lord Sunday
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As Arthur Penhaligon seeks to find the seventh key, complete his quest to save the kingdom to which he is heir, and learn his true identity, he discovers that he has a greater purpose than he could have imagined.
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When their house mysteriously explodes and they are sent to live with an unknown relative named Grandma X, twelve-year-old twins Jaide and Jack Shield learn that they are troubletwisters, young Wardens just coming into their powers, who must protect humanity from The Evil trying to break into earth's dimension.