People occasionally ask if our featured titles are just whatever's selling best, and the honest answer is no — a pure bestseller list would drift toward the same three or four categories every month, and we'd stop featuring anything from the smaller shelves at all.
The actual process starts with a simple quota: every featured rotation has to include at least one title from each of our six categories, no exceptions. That rule alone does most of the work of keeping the selection honest, because it forces someone on our side to go looking through the gambling-history shelf or the badminton shelf even in a month where cricket content is having a moment.
From there, we weight toward books that are either genuinely new to the catalog or have been quietly well-reviewed without much visibility — the "Talking to Someone You Love About Gambling" kind of title that doesn't have flashy marketing but consistently earns strong, specific feedback from the people who read it.
We also try not to feature the same author twice in a row, even when they've written multiple strong titles, because the featured shelf is supposed to be a discovery tool, not a highlight reel for whoever had the best launch. It's a small set of rules, applied consistently, rather than any kind of algorithm — which is a very unglamorous answer, but it's the true one.