Kylie Shaw has found a home and a quiet place to work as an illustrator of children's books in little Knights Bridge, Massachusetts. No one seems to know her here -- and she likes it that way. She carefully guards her privacy in the refurbished nineteenth-century hat factory where she has a loft. And then California private investigator Russ Colton moves in. Russ is in Knights Bridge to keep his client and friend, eccentric Hollywood costume designer...

For all the books they have written, Andy is the narrator and Terry is the illustrator, but when Terry tries to narrate too, the story goes out of control and they must evade the Story Police, who want to arrest them for crimes against storytelling.

When their over-the-top ideas expand their amazing treehouse to include a giant submarine sandwich shop and a human pinball machine, Andy and Terry find themselves babysitting Mr. Big Nose's three troublesome grandkids.

"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). It is a toilet paper factory, and an extraterrestrial observation center for observing aliens. As it turns out, though, it's Andy, Terry, and Jill who are being observed and then abducted by a giant...