Clara’s Verdict
Robert Muchamore’s CHERUB series has been a fixture of British children’s and YA fiction for the better part of two decades, and the audiobook adaptations – narrated by the consistently excellent Simon Scardifield – are among the most reliably entertaining in this category. The Sleepwalker is a mid-series entry that demonstrates why the formula keeps working: the premise (a secret government agency staffed by highly trained child operatives, deployed because adults simply won’t suspect children of spying) is as effective as ever, and Muchamore’s plotting is crisp and purposeful. Three hundred and forty-five people are dead, a traumatised twelve-year-old is making accusations to a police hotline, and only CHERUB agents can get close enough to find out whether any of it is true. For the right age group – and for nostalgic adults who came of age with this series – it delivers exactly what’s needed, and does so with genuine craft.
About the Audiobook
An airliner explodes over the Atlantic, killing all 345 people aboard. Crash investigators suspect terrorism but have nothing concrete. Then a distressed twelve-year-old rings a police hotline, claiming his father was responsible for the explosion. The problem: the boy has a documented history of violence and emotional instability, there’s no hard evidence, and conventional investigators can’t get close to the family without alerting the father. CHERUB agents can. Adults never suspect that children are intelligence operatives. That institutional blind spot is the entire basis of the programme, and Muchamore exploits it with his usual efficiency.
What lifts this beyond standard thriller plotting is the emotional complexity Muchamore gives to the twelve-year-old at the centre of the case – a child caught between loyalty to a father he loves and knowledge of something he cannot unknow. This strand of the book is handled with more care than the genre usually demands, and it gives the investigation stakes that go beyond the procedural. Muchamore has always understood that his readership is neither naive nor undemanding, and he writes accordingly.
This is a mid-series entry; readers unfamiliar with the CHERUB universe will find it functions reasonably well as a standalone, though some familiarity with the characters and setup from earlier volumes adds depth. Published by Hachette Children’s Books, running to five hours and fifty-five minutes – well-judged for its intended audience. The series is published under Muchamore’s own name throughout.
One of the more interesting things about the CHERUB series, reflected in this instalment, is Muchamore’s consistent refusal to treat his young protagonists as infallible or invulnerable. The agents make mistakes. They experience genuine fear. They carry the weight of what they’ve seen and done. This realism – emotional rather than procedural – is what gives the series its staying power and what distinguishes it from action-adventure fiction that treats danger as merely exciting rather than genuinely consequential.
The Narration
Simon Scardifield has narrated extensively across the CHERUB catalogue, and his comfort with Muchamore’s world is evident in every scene. He captures the CHERUB agents convincingly – young without being irritating, competent without being superhuman – and handles the thriller elements with the controlled pace that keeps younger listeners fully engaged. His voice work across the ensemble cast is clear and distinguishable without resorting to excessive theatricality. Scardifield is one of the stronger YA narrators working in British audio, and his stewardship of this series has been a significant component of why the audiobooks work as well as they do. For younger listeners particularly, the narration makes the difference between an audiobook that holds attention and one that loses it.
What Readers Say
The Sleepwalker holds a rating of 5.0 out of 5 from listeners on Audible UK, though the review count is modest. The available review describes it as “fantastic” with a “great plot line.” Across the wider CHERUB series, the listener consensus is consistent over many years: Muchamore writes pacey, intelligent thrillers that respect the intelligence of his readership, handling serious subject matter – terrorism, organised crime, moral complexity – without sensationalising it. The audiobook format suits the material well, and the series has introduced these stories to a new generation of listeners who might not have discovered them through print.
Who Should Listen?
The CHERUB series is designed for readers aged eleven and above, but in practice the audience is considerably wider – adults who grew up with the books return to them regularly, and parents find themselves genuinely invested during family listens. The Sleepwalker is ideal for teenagers who enjoy spy fiction, action-adventure, or any story where young people are given genuine agency and real responsibility. It also works for family listening on longer journeys, though parents should know that the series doesn’t avoid serious subject matter. If you’re looking for a gift for a reluctant reader or listener between ten and fifteen, CHERUB is one of the more reliable recommendations in children’s audio.
Listen to Cherub: The Sleepwalker on Audible UK – find it here and give it to the young thriller fan in your life.
