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Onyx Storm is the third Empyrean novel, after Fourth Wing and Iron Flame. In the UK, Hachette lists a paperback for £10.99 (ISBN 9780349437095) with an on-sale date of 24 March 2026, and provides links to several booksellers. In the US, a Bookshop.org search result showed hardcover and ebook listings, but its displayed offers were not verified on a product page. Prices and stock can change, so check the retailer for your country and chosen format before ordering.
Where can you buy Onyx Storm?
The clearest UK buying route is the Hachette UK paperback listing, which links to Amazon UK, Blackwell’s, Bookshop.org UK, Foyles, Hive, Waterstones, TGJones and Wordery. Those links are retailer options, not confirmation that each seller currently has stock. Hachette’s page also states that it may earn commission from purchases made through its retailer buttons.
For the US, a Bookshop.org search listing surfaced a hardcover and an ebook. The listing showed $30.75 for the hardcover, compared with a displayed $32.99, and $14.99 for the ebook. These are time-sensitive search-result prices; the product page could not be verified, so confirm the format and current offer with Bookshop.org before buying.
UK paperback details
| Detail | Hachette UK listing |
|---|---|
| Format | Paperback |
| ISBN | 9780349437095 |
| Listed price | £10.99 |
| On-sale date | 24 March 2026 |
These are UK listing details, not a universal price or release date. Check the seller’s current listing for availability, delivery or collection options, and the exact edition.
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What to compare before ordering
- Market: Choose a retailer serving your country; prices and editions vary by territory.
- Format: Confirm whether you want paperback, hardcover or ebook. The cited Hachette UK page is for the paperback; the US search result surfaced hardcover and ebook offers.
- Price and fulfilment: Check the live price, shipping cost, delivery estimate or pickup availability with the bookseller.
- Edition details: If a specific cover design or bonus material matters to you, verify it on the individual product page. The listed ISBN and the author-page ASIN identify particular listings, not every edition.
Which book is Onyx Storm?
Rebecca Yarros’s official series page identifies Onyx Storm as Empyrean, Book 3, following Fourth Wing and Iron Flame. The author’s page lists ASIN B0CW1GZXZT; that identifier should not be taken as applying to every market or format. The publisher description says Violet must leave the failing wards to seek allies for Navarre.
The author’s listed content warnings include war, battle, perilous situations, intense violence, brutal injuries, death, poisoning, graphic language and sexual activities shown on the page. Readers who want more detail can consult the author’s official Empyrean series page.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
