Heritage businesses in Singapore have had mixed fortunes. Some, by innovating and adapting to evolving consumer tastes, have managed to continue thriving, but others in sunset industries can only do so much to stay relevant.  You would be hard pressed to find a shop in Singapore that does not accept cashless payment or have an online presence, least of all in the upscale shopping belt that is Orchard Road. Yet, in these respects and more, 34-year-old ANA Book Store at Far East Plaza remains