Yesterday I was walking with a friend in Causeway Bay, when she suddenly pointed at one of the countless colourful billboards that decorate the shopping district's building facades and said, "That's the bookstore of the missing booksellers !". The bookstore is called " Causeway Bay Books " (銅鑼灣書店) and it's located on the second floor of a building on Lockhart Road. I and my friend went upstairs and, of course, the bookstore was closed. Next to the entrance door there were messages written on the wall by sympathetic citizens.