Introducing your new literary obsession: The Mermaid and Mrs Hancock. Set in 1785, the debut novel from 30-year-old Imogen Hermes Gowar tells the story of Jonah Hancock, who’s catapulted into high society when he finds himself in the possession of a mermaid. Having made the acquaintance of Angelica Neal – London’s most desirable courtesan – both of their lives take a dangerous new course as their ambitions drive them to ever greater extremes… and the mermaid begins to exert its destructive power.

To celebrate the publication of what’s destined to become one of the year’s bestsellers, we’ve teamed up with Vintage to give one winner a copy of the book, plus a bespoke fragrance customisation from Floris, the British family perfumers founded in 1730 (the same era as Gowar’s novel). You’ll enjoy a two-hour appointment with a Floris perfumer in London to create your own unique 100ml eau de parfum, complete with a Certificate of Provenance. By creating your own fragrance, you’ll be adding to private perfume ledgers dating back nearly 300 years. The experience is worth £450 but it sounds priceless to us…

Five lucky runners up will also receive a hardback copy of the bestseller, so don’t miss out on your chance to win.

For your chance to win, simply answer the following question…