Dan Brown‘s latest thriller, “The Ultimate Secret,” reached the top of the books charts in Flanders, Belgium, in 2025, signaling the continued popularity of the American author’s work internationally[[2]]. The ranking,compiled by market research firm GfK adn reported by Boekhandels Vlaanderen,highlights key trends in the region’s robust literary market[[1]]. The results also showcase the growing influence of both established authors and emerging online personalities within the publishing industry.
A novel by American author Dan Brown topped the best-seller list in Flanders, Belgium, in 2025, according to data released by market research firm GfK. The book, titled “The Ultimate Secret,” captured the top spot in sales for the region. Melissa Da Costa’s “All the Blue of the Sky” came in second place, while influencer Timon Verbeeck secured two positions within the top ten best-selling books.
The strong performance of “The Ultimate Secret” signals continued international demand for Brown’s thriller novels, a key driver of revenue for his publisher. Flanders’ book retail federation, Boekhandels Vlaanderen, compiled the rankings based on sales figures from GfK.
Da Costa’s “All the Blue of the Sky” maintained a strong showing, indicating sustained reader interest in the author’s work. Notably, Timon Verbeeck, a prominent social media influencer, achieved significant book sales, demonstrating the growing influence of online personalities in the publishing industry.
The data from Boekhandels Vlaanderen provides a snapshot of consumer preferences within the Flemish book market, a region known for its robust literary culture. The rankings reflect sales data collected throughout 2025.
