For a vast amount of famous novels, there are Mandarin translations available. Most of the Harry Potter (哈利波特) books I have read in Taiwan editions with traditional Chinese characters, one from China with simplified characters. Hong Kong is quite productive as well in this field. But some of the books are hard to get in Europe. Maybe it’s easier in the US. If you wish to have a certain novel in Chinese just look it up on Google, Wikipedia, or Amazon. I just wrote “old man and the sea + Chinese” in the Google search bar and found several entries.