Identification points are listed only where two independent sources agree. Last reviewed 20 Oct 2026.
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Kill Joy, the prequel novella to A Good Girl's Guide to Murder, was written for World Book Day 2021 and issued by Electric Monkey on 18 February 2021 as one of the £1 World Book Day titles, alongside an ebook. The first issue is the slim World Book Day paperback with World Book Day branding. The Electric Monkey (HarperCollins) paperback of 4 August 2022, ISBN 9780008560713, £7.99, states that it was previously published in 2021 as a World Book Day title and is a later edition. The Delacorte Press paperback of 28 February 2023 (ISBN 9780593426210, $12.99) is the first US edition.
We have not yet confirmed the issue points that tell this first impression from later ones. Until we do, compare your copy's title page and copyright page with the publisher, place and year above: any later printing or edition statement means it is not this one.
Know the points? Tell us. We publish them, with credit, once a second source agrees.
Electric Monkey, London, in 2021, in paperback.
Points of issue are listed only where at least two independent sources agree. Last reviewed 20 October 2026. Reviewed by Harriet Ellis; read how we check facts.
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