Chris Columbus & Chris Rylander 
Clash of the Worlds [EPUB ebook] 

The third and final book in the epic HOUSE OF SECRETS series. Get ready for another roller coaster ride of an adventure!The Walker kids — Cordelia, Brendan and Nell — may have saved the world, but they can’t save their home and must leave Kristoff House. Things can’t get any worse, but then…Turns out the Wind Witch is still alive and planning an invasion. To defeat her the Walkers must return to the book world, split up and embark on a dangerous quest — facing aliens, dinosaurs and monstrous creatures from the deep.The Walkers always have each other’s backs, but must go it alone in their most important mission yet. And this time, if they fail, there’s no coming back…