Sam Kee Book Co.
Time Out says
Established in 1964, this store is not your ordinary second-hand book shop, it’s also a stray cat sanctuary. Many of the books here are in Chinese, but it’s worth a visit if you’re interested in books in other foreign languages, from Nordic thrillers to Japanese manga, or if you like cats too. Remember not to pet the cats though, as they’re used to being left alone.