When her struggles with anxiety worsen in the aftermath of a family death, Lottie is bequeathed a series of letters from her late aunt, a best-selling author, who leaves instructions to help Lottie overcome her fears and explore her own literary voice.

In this story told mostly through letters, busybody Dick Tater tries to ban Halloween and ghost stories, as well as to break up the popular writing team of I. B. Grumply, ghost Olive C. Spence, and eleven-year-old illustrator Seymour Hope.

In this story told mostly through letters, Noah Breth's feuding children come to Ghastly, Illinois, to follow a trail of limericks to their inheritance, while Seymour tries to convince Iggy and Olive to let him keep Mr. Breth's dog.

"Andy and Terry are once again inviting readers to come hang out with them in their astonishing 39-story treehouse (it used to be 13 stories, then 26 stories, but they keep expanding). And this year they will have even more time to jump on the world's highest trampoline, toast marshmallows in an active volcano, swim in the chocolate waterfall, pet baby dinosaurs, and go head-to-trunk with the Trunkinator, since Terry has created the greatest invention...

Andy and Terry try to solve the mystery of: What happened to Mr. Big Nose? After all, it's hard to turn in your next book when your publisher has vanished.

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.