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Impossible Creatures

by Katherine Rundell

A richly imagined, beautifully written fantasy about two children fighting to save a hidden world of magical beasts, with prose sharp and funny enough to win over adults too.

What It's About

Impossible Creatures follows Christopher, a boy who rescues a baby griffin and discovers that a secret chain of islands, the Archipelago, has sheltered magical creatures for millennia. He soon crosses paths with Mal, a girl from that world who is being hunted and who needs his help. The magic sustaining the islands is draining away, creatures are dying, and the two children travel from island to island trying to learn why before it is too late.

Rundell writes with a compressed, witty, aphoristic style, so even quick action scenes carry lines that feel worth rereading. The creatures are the real showpiece: some come from old myth and folklore, others are invented, and each is described with an eye for strange, specific detail. The illustrations, map, and bestiary add to the sense of a world built with care rather than assembled from fantasy parts.

Reading it feels like a classic quest story, in the tradition of Narnia or Pullman, told with a modern awareness of loss, extinction, and responsibility. It moves briskly with real danger and some sad moments, yet it is warm and often funny. It works as a read-aloud for families and as a solo read for confident middle-grade readers, and many adults pick it up for themselves. It opens a series, but the central adventure is substantial and satisfying on its own.

Read this if you…

  • love classic quest fantasies like Narnia or His Dark Materials
  • want a beautifully written book to read aloud with a child aged roughly 8 to 12
  • enjoy mythical creatures described with real imagination and detail

Skip it if you…

  • prefer contemporary, realistic stories over secondary-world fantasy
  • want a fully self-contained story with no series to follow

Key Ideas

  1. 1

    Wonder as something worth protecting

    The book treats magic much like the natural world: fragile, astonishing, and capable of vanishing through neglect or greed. Rundell, who also writes passionately about real endangered animals, invites young readers to see that wonder is not guaranteed and that caring for living things is an active choice rather than a passive feeling.

  2. 2

    A bestiary that feels genuinely alive

    Griffins, sphinxes, kraken, and dragons appear alongside lesser-known and invented creatures, each with distinct habits, temperaments, and dangers. Rather than serving as props, the animals have their own interests and dignity. The included bestiary encourages readers to linger, compare, and return to the world after finishing the story itself.

  3. 3

    Children who must act when adults cannot

    In a familiar but well-handled quest pattern, Christopher and Mal discover that the grown-ups around them are limited, compromised, or out of reach. The story takes children's courage seriously without pretending it is easy, showing fear, doubt, and mistakes alongside bravery and loyalty.

  4. 4

    Prose that rewards reading aloud

    Rundell's sentences are short, vivid, and frequently quotable, mixing humor with sudden moments of gravity. This makes the book especially strong for shared reading, where the rhythm of the language comes through. Adults often notice the craft of the writing as much as the plot.

  5. 5

    Friendship built across two worlds

    Christopher and Mal come from very different places and have different temperaments, and their bond develops through shared danger rather than instant liking. Their friendship gives the adventure its emotional center and grounds the larger stakes of a dying world in a relationship readers can care about.

Limitations

Some readers find the plot follows a fairly traditional chosen-children quest structure, with a hurried pace that leaves certain islands and characters underexplored. The density of creatures and invented terms can be a lot to track for younger or reluctant readers. A few adults feel the striking prose sometimes outshines the characters, and Christopher in particular can seem less vivid than Mal. There are moments of peril, death, and sadness that may affect sensitive young readers. As the first book in a series, it leaves threads open for later volumes.

Questions Readers Ask

What age is Impossible Creatures suitable for?
It is generally aimed at readers around 9 to 12, though it works well read aloud to slightly younger children. There is real danger, some violence, and creature deaths, so very sensitive readers may need an adult nearby. Teens and adults frequently enjoy it too, largely because of the quality of the writing.
Is Impossible Creatures part of a series?
Yes. It is the opening book of a fantasy series set in the Archipelago. The main adventure reaches a satisfying point, but the world and some story threads are clearly set up to continue, so readers who love it will have more to look forward to.
How does it compare to Rundell's other books like Rooftoppers?
It shares the same witty, distinctive voice and brave young heroes, but it is far more fully fantastical, with an invented world and a large cast of magical creatures. Fans of her earlier adventures will recognize the style, while readers who prefer big-world fantasy may find this her most appealing book.
Published
2025
ISBN
9780593809891
Difficulty
intermediate
Category
Children's Books

Book details and cover from Google Books.

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