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HarperCollins Children's Books · MMXVIII
Boy Underwater
Adam Baron
Chapter · ages 9–12

Boy Underwater

Written by Adam Baron · Illustrated by Benji Davies

Book 1 of 4 in Cymbeline IglooView the full series

Top giftableAdults love it too

A nine-year-old boy who has never been swimming is thrown into the deep end at his first school lesson, triggering his mum's breakdown and a hunt for the family secret behind his fear. Riotously funny narration wraps a tender story of grief and a parent's mental illness.

  • Best for9–12
  • FormatChapter
  • Length256 pp
  • Read aloud~3 hr40 min

The vibe

What it’s like.

Style

  • Conversational
  • Comedic

Tone

  • Funny
  • Warm
  • Heartwarming
  • Bittersweet
  • Thought provoking

Themes

On the pagemental illness, swimming, family secret, hospital, single parent, football

Experience meters

Energy3/ 5
Humour4/ 5
Scariness1/ 5
Peril2/ 5
Wonder2/ 5
Cosiness2/ 5
Emotional intensity4/ 5
Conceptual intensity3/ 5

What’s it about?

The story.

Cymbeline Igloo has never, ever been swimming. So when his first school swimming lesson looms he's terrified - and when a classmate shoves him into the deep end of Lewisham Pool, he sinks. Rescued by the fiercely clever Veronique, Cym is fine; but the incident sends his mum into a breakdown, and she's admitted to hospital. Determined to bring her home, Cym and Veronique start digging into a past his mum has kept hidden - one that reaches back to the dad who died when Cym was tiny, and to a secret buried in her paintings. Adam Baron's debut is narrated by one of the funniest, most endearing voices in children's fiction: chatty, observant and forever getting the wrong end of the stick. Beneath the jokes about football, best friends and embarrassing mums runs a genuinely moving story about loss, love and a boy quietly trying to hold his family together. Warm, wise and laugh-out-loud funny.

Fit check

Right for your child?

Where it lands by age

Pitched at 9-12s reading independently, with a voice funny enough to read aloud from about 8. The comedy carries younger readers, while the threads of a parent's mental illness and a father's death give it real emotional weight for the top of the range.

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  • 5
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  • 13
  • Best fit · 9–12
  • Read aloud · 8–11
  • Independent · 9–12

Prose load

Moderate

Visual support

Low

Reluctant-reader friendly

Very

Read-aloud quality

Strong

Works well for

  • Reading aloud
  • Gift-buying
  • Reluctant readers
Moderate sensitivity3 content warnings

Preview before sharing if a child is sensitive to: grief, death of parent, mental health.

Bedtime suitability

2 / 5 · Better outside bedtime

Sensitive-child

2 / 5 · Use judgement

Graphic intensity

1 / 5 · None

Best for

  • Funny and moving
  • Family stories
  • Emotional literacy
  • Reluctant readers

Avoid if

  • Wants gentle bedtime
  • Sensitive to parental illness
  • Sensitive to bereavement

Particularly good for children who are…

  • Illness in family
  • Bereavement
  • Single parent family

Why it lands

Why they love it.

Why kids love it

Cym's voice is hilarious - he panics about swimming, obsesses over football and gets everything gloriously wrong - so when the story turns to his mum and the dad he never knew, kids are already hooked. Solving the mystery alongside brainy Veronique makes them feel like proper detectives.

  • Being understood finally
  • Making a difference
  • Friendship and belonging
  • Being a detective

Why parents love it

Adam Baron handles a mother's breakdown and a child's grief with rare lightness and honesty, never losing the comedy. It opens conversations about mental illness and loss without ever feeling like a lesson, and reads aloud beautifully.

  • Shared humour
  • Conversation starter
  • Great writing

In the series

Cymbeline Igloo.

4 books · open the series →

About the creators

About the creators.

BD

Benji Davies

Illustrator · United Kingdom

Benji Davies is a British author-illustrator best known for The Storm Whale (2013) and its sequels The Storm Whale in Winter and Grandad's Island, quietly emotional picture books with a distinctive painterly, slightly retro visual style and a Scandinavian-fishing-village setting that has become one of his signatures. Davies's work tends to land in the gentle-but-serious end of the picture-book market, often handling loneliness, family change, loss and the comfort of small communities. He also illustrates for other authors (the Bizzy Bear board books) and works in animation. A reliable bedtime and gift-shelf picture-book maker for ages 3–7, with particular strength in emotional weight done lightly.

More from Benji Davies

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Last reviewed · July 2026Suggest a correctionHow we recommend

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