Clash of the worlds by Chris Columbus, Ned Vizzini, Chris Rylander

House of Secrets series. HarperCollins, 2016. ISBN 9780007465859
(Age: 9+) Clash of the Worlds concludes the action-packed adventure House of Secrets trilogy. Chris Rylander co-authored this final novel with Chris Columbus after the death of Ned Vizzini in 2013.
The Walker children are once again in the midst of a difficult situation; their father's gambling addiction has led to the selling of their mansion and their subsequent return to their previous small apartment. Eleanor and Cordelia sneak out in the dark of night; spend all their birthday money on raw meat to feed their friend Fat Jagger, a huge colossus who has escaped from his book into their world. Unfortunately, other book characters have also crossed over and it is up to the Walkers to remedy the situation. Brendan's attempt to raise Denver Kristoff the author of the book worlds has released a Zombie Apocalypse.
Of course, Brendan, Cordelia and Eleanor must return to the story worlds to right the wrongs and pursue the three Wordkeeper objects needed for permanently sealing off the fantasy world from the real one and rescuing Fat Jagger. The evil Wind Witch needs to be stopped, before she leads her army into San Francisco.
For the best outcome, the three Walkers need to split up, each paired with a book character. They race through Western world, the science fiction and fantasy books, to Atlantis, endure epic battles, frightening life and death situations, with the action continually switching focus. Unbelievable events occur; Cordelia and Adie's dramatically escape from the blue whale, Brendan encounters animated mummies, dealing with duplicate treasure maps and aliens and Eleanor needs rescuing from Castle Corroway.
The authors have written a nonstop action, fantasy adventure suited to fans from 9 years, as their offsiders pay a high price for assisting the Walkers.
Rhyllis Bignell