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The final book in the New York Times bestselling House of Secrets series that was called "a breakneck, jam-packed roller coaster of an adventure" by J. K. Rowling. Created by Hollywood director Chris Columbus (of Harry Potter fame) and bestselling author Ned Vizzini (It's Kind of a Funny Story), with the acclaimed author of the Codename Zero series and the Fourth Stall saga, Chris Rylander.

With their last adventure just barely over, the Walker kids thought life would finally go back to normal. But things don't remain calm for long . . . especially when the colossus Fat Jagger turns up in San Francisco Bayâ??and he's in danger!

With the police closing in, the Walkers must figure out how to save their giant friend. When a frost beast is spotted in Santa Rosaâ??and more mystical creatures start appearing all over Americaâ??it's soon clear that the characters from Denver Kristoff's works are invading the real world. It's up to Brendan, Eleanor, and Cordelia to reenter the book world one last time to keep the worlds from colliding, causing mass destruction.

They will have to track down three Worldkeepers hidden in Kristoff's booksâ??magical items that when used together will seal the worlds off for good. But the Walkers' first move leads them straight into the Wild West, with lethal outlaws and lawless deputiesâ??and that's just the beginning. They'll encounter dinosaurs, aliens, killer robots, and the Wind Witch herselfâ??with new friends and oldâ??and be faced with some of the deadliest choices they'll ever have to make. The scariest thing of all could be deciding who to trust, since everyone is hiding