A group of children, entranced with the study of Egypt, play their own Egypt game, are visited by a secret oracle, become involved in a murder, and befriend the Professor before they move on to new interests, such as Gypsies.

"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."--

Imaginative, eleven-year-old Gina, her mysterious new neighbor, Antonio, and their classmates are inspired by an unusual young teacher to see who they are and envision who they are meant to become.

Andy and Terry recount the story of how they first met, an adventure marked by emergency shark operations, giant storms, and wooden pirate heads.

"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...

Anne, an eleven-year-old orphan, is sent by mistake to live with a lonely, middle-aged brother and sister on a Prince Edward Island farm and proceeds to make an indelible impression on everyone around her.

Drew, whose animated doodles rarely stay on the page of her sketchbook, must rein them in while on a trip to the Art Institute of Chicago.

"Esther Gold loves Halloween more than anything in the world. So she is determined to go trick-or-treating again this year despite the fact that her parents think she is officially too old... But when the night rolls around, something feels... off. No one is answering their door. The moon is an unnatural shade of orange. Strange children wander the streets, wearing creepy costumes that might not be costumes at all"--

After Kevin's mother abandons him, he takes refuge in his fantasy of becoming a cowboy, but his reality is a foster home and grandparents he doesn't know.

After Nobody destroys the connection between fictional and nonfictional worlds, causing nonfictional people to lose their imaginations, Owen and Bethany must risk everything to save multiple realities.