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Circulus de Potentia

From the Magicae Mathematica series , Vol. 2

An ideal read for middle-graders who like plenty of magic and adventure.

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West (Libellus de Numeros, 2014) returns with another historical YA novel in his series about young Alex and her continuing adventures in a magical world.

This book picks up after the first volume left off and soon reintroduces Alex, the heroine of the first installment, and her friends, who take part in a celebration for Nosaj, one of many students of Archimedes who helped save the city from outside invaders. Later, a mysterious man comes to the local arena wearing a circlet inscribed with an equation featuring the symbol pi. This causes Archimedes to call upon Alex and her friends to go on a quest to find Pythagoras, perhaps the only man who understands what pi means, so the mystery man can be stopped before he fights all 100 Guardians, the city’s elite fighting force, and wreaks further havoc. Meanwhile, throughout the work, Diades and Demetrius, embittered former apprentices of Archimedes, plot to destroy what the city holds dear and to thwart Archimedes himself. Alex and her friends display courage, ingenuity, and maturity in the face of obstacles, and they know their math, just as they did in the first book of the series. In the end, Archimedes confronts the threat to the city (for now) in a manner that has just as much to do with Alex and her accomplishments as it does with the mystery of pi. She’s about to embark on yet another adventure as the book closes. West never forces mathematics or Latin on readers, but they both exist on the edges of the story. Readers will get comfortable pondering equations for determining volume and square roots, and they may pick up some Latin from the spells that Archimedes’ students use. There’s a looming sense in this book of an impending battle between good and evil, which lends every character’s actions a certain gravity. Overall, the novel is fast-paced and exciting and is a worthy follow-up to the first installment in the series.

An ideal read for middle-graders who like plenty of magic and adventure.

Pub Date: June 29, 2015

ISBN: 978-1-5146-4168-2

Page Count: 232

Publisher: CreateSpace

Review Posted Online: Aug. 4, 2015

Kirkus Reviews Issue: Sept. 1, 2015

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  • New York Times Bestseller

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THE WILD ROBOT ON THE ISLAND

A hymn to the intrinsic loveliness of the wild and the possibility of sharing it.

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What happens when a robot washes up alone on an island?

“Everything was just right on the island.” Brown beautifully re-creates the first days of Roz, the protagonist of his Wild Robot novels, as she adapts to living in the natural world. A storm-tossed ship, seen in the opening just before the title page, and a packing crate are the only other human-made objects to appear in this close-up look at the robot and her new home. Roz emerges from the crate, and her first thought as she sets off up a grassy hill—”This must be where I belong”—is sweetly glorious, a note of recognition rather than conquest. Roz learns to move, hide, and communicate like the creatures she meets. When she discovers an orphaned egg—and the gosling Brightbill, who eventually hatches—her decision to be his mother seems a natural extension of her adaptation. Once he flies south for the winter, her quiet wait across seasons for his return is a poignant portrayal of separation and change. Brown’s clean, precise lines and deep, light-filled colors offer a sense of what Roz might be seeing, suggesting a place that is alive yet deeply serene and radiant. Though the book stands alone, it adds an immensely appealing dimension to Roz’s world. Round thumbnails offer charming peeks into the island world, depicting Roz’s animal neighbors and Brightbill’s maturation.

A hymn to the intrinsic loveliness of the wild and the possibility of sharing it. (author’s note) (Picture book. 3-6)

Pub Date: June 24, 2025

ISBN: 9780316669467

Page Count: 48

Publisher: Little, Brown

Review Posted Online: March 22, 2025

Kirkus Reviews Issue: April 15, 2025

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NIMBUS

A deeply imaginative journey that puts the “cat” in cathartic.

A loyal black kitten’s boy is under supernatural attack.

Eleven-month-old Nimbus loves Fletcher, the boy who nursed her back to health following life-threatening injuries. When Fletcher becomes curious about a strange jar and opens it, releasing a terrible goblin, loyal Nim protects Fletcher, taking heavy damage in the process. But Fletcher’s aunt, who’s caring for him over spring break, believes Nim attacked Fletcher and dumps her far from home. Rhett, a stylish rat with star quality, befriends injured Nim and leads her to a witch’s house. While the witch cares for Nim, the witch’s cats (maternal Fern, bookish Rochester, standoffish Bianca, and openly hostile Abraxas) teach Nim important cat skills. She also discovers she has a supernatural ability: In destroying one eye of the nightmare demon in the fight to protect Fletcher, Nim gained its “dream sight.” But she also learns it might come back for Fletcher, who no longer has Nim to protect him, posing a time-sensitive, high-stakes threat. Even though the witch’s home is nice and magic itself seems to be telling her to stay put, Nim wants to find a way back to Fletcher. As a hero, Nimbus is as gritty and determined as she is adorable. Tear-jerker moments explore pet abandonment—readers may want their own pets on hand to hug—all the way through the magical, action-packed finale. Fletcher and the witch read white.

A deeply imaginative journey that puts the “cat” in cathartic. (Fantasy. 8-12)

Pub Date: Sept. 5, 2023

ISBN: 9780062680372

Page Count: 336

Publisher: Balzer + Bray/HarperCollins

Review Posted Online: July 13, 2023

Kirkus Reviews Issue: Aug. 1, 2023

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