(3) K-3 Mip challenges Pip to a race to build the tallest treehouse. Impulsive Mip gets to work right away, while planner Pip drafts detailed blueprints. When things don't go as hoped, the two young fairies work together and discover the joys of teamwork. The mixed-media art has an immersive 3D quality that makes the fairies and their creations pop off the page.

Reviewer: Meredith Madyda

(3) 4-6 Introspective Joey discovers that a girl has built a treehouse (mistaken for a spaceship) on the hill he visits alone to play his guitar. He nicknames the girl "Marsh," short for Martian, and is baffled and fascinated by her. As the two forge a friendship based on music, Marsh's poignant backstory emerges. This well-crafted Australian novel explores the nuances of friendship and family.

Reviewer: Renée Wheeler

(3) K-3 Illustrated by Jamey Christoph. Manhattan child Bob builds a treehouse in Central Park. When the city dismantles it, he builds another, and so on until as a man he's confronted by a park employee...who offers him a job caring for the trees. Inspired by true events, the story is placidly told, and the art gives the city an alluring serenity. Includes an epilogue about real arborist Bob Redman.

Reviewer: Nell Beram

(3) 4-6 Illustrated by Douglas Holgate. In this entertaining fourth Last Kids on Earth book, Jack plans a makeshift Christmas celebration to cheer up his snowbound friends (and fellow monster-apocalypse survivors). But then a new human villainess kidnaps Jack's friend Dirk for a ritual sacrifice, and Jack and company must prevent her from summoning an evil extra-dimensional entity. Dynamic comic book–style illustrations featured throughout once again support the story's well-rounded characters, humor, and action.

Reviewer: Russell Perry

(4) K-3 Illustrated by Shawn Harris. "A citizen's not what you are--a citizen is what you do. / A citizen cannot forget the world is more than you." Harris's mixed-media illustrations roughly shape Eggers's rhyming text into a story about a diverse group of children working together to build an elaborate treehouse. Though the book may not solidify a reader's understanding of citizenship, it should spark discussion about it.

Reviewer: Bridget McCaffrey

(3) 4-6 Illustrated by Terry Denton. Author-illustrator best friends Andy and Terry have an epic fight in 78-Story after Andy is fired from Treehouse: The Movie, but they reunite to stop "mooo-vie-making spy cows." In 91-Story, their publisher Mr. Big Nose asks them to babysit his three grandchildren while they're on deadline. Wacky humor and zany adventures abound in these sixth and seventh installments illustrated with engaging sketchlike cartoons. Review covers these titles: The 78-Story Treehouse and The 91-Story Treehouse.

Reviewer: Lana Barnes

(3) 4-6 Illustrated by Terry Denton. Author-illustrator best friends Andy and Terry have an epic fight in 78-Story after Andy is fired from Treehouse: The Movie, but they reunite to stop "mooo-vie-making spy cows." In 91-Story, their publisher Mr. Big Nose asks them to babysit his three grandchildren while they're on deadline. Wacky humor and zany adventures abound in these sixth and seventh installments illustrated with engaging sketchlike cartoons. Review covers these titles: The 78-Story Treehouse and The 91-Story Treehouse.

Reviewer: Lana Barnes

(4) K-3 Illustrated by Emily Hughes. This story about building a treehouse is an adventure in imagination, with appealing, whimsical illustrations showing a multicultural cast of kid-builders. The text may puzzle some young readers and listeners with its layers of narration and overly poetical language. Still, the fantastical structures in Hughes's art, hand-drawn in graphite and with Photoshop, are awe-inspiring.

Reviewer: Cyrisse Jaffee

(2) K-3 Illustrated by Qin Leng. Russell and his father build a simple tree fort in their new house's maple tree. While their neighbor's newly erected fort, fancy and customized, is objectively "better," the time Russell and his father spent together makes theirs more valuable. Leng captures the loving father-son relationship in a warm palette balanced with generous white space; Kerrin includes subtle moments of humor throughout the story.

Reviewer: Minh Lê | Horn Book Magazine Issue: May, 2018

(2) K-3 Illustrated by Sonia Sánchez. Ruby wants to build a fort. In true "Little Red Hen" fashion, her brothers won't help, so she learns how to do it herself. She enjoys solitary playtime in the completed fort until the boys finally get a clue. Maier's girl-power-meets-classic-folktale story line is engaging and entertaining. Sánchez's colorfully patterned and textured illustrations give dimension to a determined and endearing pigtailed heroine and her realistic multigenerational, multi-skin-toned family.

Reviewer: Elissa Gershowitz | Horn Book Magazine Issue: March, 2018

(3) 4-6 Illustrated by Douglas Holgate. Monster-apocalypse survivor Jack worries he'll lose his friends forever if they successfully make radio contact with other humans. Determined to convince his pals to stay, Jack distracts them at an abandoned theme park, only to realize he's been mind-manipulated by the evil King Wretch. Comic book–style illustrations, action, humor, and well-developed characters combine for another entertaining Last Kids on Earth book.

Reviewer: Russell Perry

(4) K-3 I Can Read Book series. The Tooth Fairy asks for Pete's help (Lost Tooth); Pete invites his friends over to play in his new treehouse (Tip-Top). Levelheaded Pete keeps his trademark cool when a tooth can't be found and when his treehouse needs expanding for a party. The stories are slight, but series fans should enjoy the playful illustrations that complement these simple emergent-reader texts. Review covers these I Can Read Book titles: Pete the Cat and the Lost Tooth and Pete the Cat and the Tip-Top Tree House.

Reviewer: Cynthia K. Ritter

(4) PS A puppy awakens to strange noises. Outside, a Dalmatian is at work in a digger; then comes a camel in a crane; and so on. Watching these big machines is exciting enough ("I love cranes!" exclaims the rapturous pup), but then a final spread reveals that the crew has built the puppy a treehouse. Dynamic illustrations and onomatopoeic vehicle sounds add appeal to the slight story.

Reviewer: Katie Bircher

(2) K-3 Illustrated by Fred Koehler. A trio of kids sets off from a treehouse to explore a backyard with a flashlight. Digitally colored pencil drawings show the realistic elements of the backyard in the darker parts of the picture, while the beam of light emitted from the flashlight reveals all sorts of imaginative settings: a pirate ship; an Egyptian tomb. It's an old-fashioned, rip-roaring imaginary adventure.

Reviewer: Susan Dove Lempke | Horn Book Magazine Issue: September, 2017

(2) PS Illustrated by Paola Zakimi. A little girl heads outside on a windy day with her yellow raincoat, umbrella, and lamb-like little dog. After waiting out a rain shower in a treehouse, she floats her open umbrella in a puddle, and then sets up a pretend tea party in a sandbox. This quiet picture book, with its spare, whimsical text and illustrations in muted colors, celebrates the joys of old-fashioned playtime.

Reviewer: Susan Dove Lempke | Horn Book Magazine Issue: May, 2017

(2) 4-6 Fifth grader Winnie Malladi-Maraj, exhausted by her competitive custody-sharing parents, moves into her treehouse. Nine classmates with their own family gripes join her, and the "Treehouse Ten" have an extremely good romp before communal kid-life eventually breaks down. The highly textured narrative--incorporating Post-it notes, texts, doodles, maps, and more--is a good-natured satire of helicopter parenting and a celebration of child ingenuity.

Reviewer: Sarah Ellis | Horn Book Magazine Issue: July, 2017

(3) 4-6 Illustrated by Terry Denton. Author-illustrator friends Andy and Terry (The 13-Story Treehouse, et al.) travel through time in this fifth installment. They must obtain a building permit that will save their treehouse from being demolished by a rhyming, bubble-wrap-obsessed building inspector, all before their next publishing deadline. Each plot-centric chapter is its own mini-adventure chock-full of action and absurd humor, including cheeky commentary from animals and silly, sketchlike cartoons.

Reviewer: Lana Barnes

(3) PS With plans to build a grand house, a couple buys land on which a tree stands. But removing the tree would leave many animals homeless, so the couple (expecting their own child) builds a treehouse instead. The thoughtful fable could provoke discussion about homes, nature, and environmental responsibility. Perfectly suited to the ultra-spare text, cartoonlike pen and watercolor illustrations convey big emotions with few strokes.

Reviewer: Carolyn Shute

(3) K-3 Ink and watercolor illustrations wordlessly tell of two neighboring children, a boy and a girl, who develop a friendship while building a treehouse together. A mostly black-and-white palette slowly integrates summery colors as the story's details unfold and camaraderie blooms through shared endeavor. Young readers can find their own interpretations of this fine story of childhood companionship.

Reviewer: Rita Soltan

(3) K-3 Illustrated by Hui Skipp. A more-magical-than-mechanical robot uses simple machines to help a diverse group of friends build a treehouse to the tune of "London Bridge Is Falling Down." Bright, cheerful acrylic and digital-collage art matches the accompanying singalong DVD's animation. Illustrated endnotes effectively explain simple machines and introduce very basic robotics and programming; musical notation also appended.

Reviewer: Dorrie Karlin