Eleven-year-old Zach knows he is too old to have an imaginary playmate, but between grieving for the loss of his father and coping with bullying at school the only place he seems to find joy is in his fantasy world with his best friend Shovel.

Andy and Terry must get past their differences to save their story ideas from a herd of spy cows.

Andy and Terry live in a 26-story treehouse. (It used to be 13 stories, but they've expanded.) It has a bumper car rink, a skate ramp, an antigravity chamber, an ice cream parlor with 78 flavors, and the Maze of Doom-a maze so complicated that nobody who has gone in has ever come out again. Well, not yet, anyway. This time, the two friends have a whole week to finish their next book, and Andy even knows what it should be about-the story of how he...

"It's the night before Christmas but Andy and Terry aren't ready yet! They haven't written their letters to Santa, they haven't sung any carols or hung their stockings, and now Mr. Big Nose wants their next book done by tomorrow. When Santa Claus's sleigh crash-lands in the treehouse, the reindeer become tangled in the branches and Santa falls into the cloning machine. With dozens of Santas running around and no way to tell which one's the real one,...