Andy and Terry travel through time trying to save their treehouse from highly talented, angry ants and Inspector Bubblewrap the building inspector while rushing to meet their publisher's deadline.

"Andy and Terry live in a 91-story treehouse. (It used to be a 78-story treehouse, but they keep getting ideas for new stories!) It has a submarine sandwich shop that serves sandwiches the size of actual submarines, an air-traffic control tower, a human pinball machine, a spin-and-win prize wheel, a giant spider web -- with a giant spider! -- and a big red button, which they're not sure whether to push or not because they can't remember what it does....

When Andy develops a severe toothache that prevents him from writing new jokes for their book, Terry uses their fantastical treehouse's money-making machine funds to purchase a Joke Writer 2000, with unexpected results.

"Andy and Terry live in a 130-story treehouse. (It used to be a 117-story treehouse, but they added another 13 stories.) It has a soap bubble blaster, a time-wasting level, a 13-story igloo, the GRABINATOR (it can grab anything from anywhere at any time), a toilet paper factory, and an extraterrestrial observation centre for observing aliens. As it turns out, though, it's Andy, Terry and Jill who are being observed -- and then abducted -- by a giant...

"Andy and Terry live in a 169-story treehouse...It now has a kangaroo-riding range, a Whatever-Weather-You-Want dome, and a hall of fun-house mirrors--the perfect place to hide from the truancy officer who is trying to catch them and Jill and make them go to school! Unfortunately, the hall of fun-house mirrors is also the place where their evil troublemaking twins, Anti-Andy, Terrible-Terry, and Junkyard-Jill, live in a doppelganger mirror, and they...