I didn’t put two and two together. Secret Maps, the British Library exhibition (previously), has an accompanying book, because British Library exhibitions invariably come with books. And that book was already listed on my Map Books of 2025 page: Secret Maps: How they Conceal and Reveal the World by Tom Harper, Nick Dykes, and Magdalena Peszko, who curated the exhibition, is out now from British Library Publishing; it comes out in the U.S. in a couple of weeks, under the title Secret Maps: Maps You Were Never Meant to See, from the Middle Ages to Today, from the University of Chicago Press.

Secret Maps by Tom Harper, Nick Dykes and Magdalena Peszko. British Library, 24 Oct 2025, £40. University of Chicago Press, 14 Nov 2025, $39. Amazon (Canada, UK), Bookshop.