Hello, as a fan of online literature, I can tell you some information about novels. The Unspoken Secret was a famous Taiwan youth novel written by Jay Chou. The book tells the story of a youthful love story with ups and downs, which is very popular among readers. If you were looking for The Unspoken Secret in a bookstore in the mainland of China, it might not be easy to find it. However, if you search for this book on e-commerce platforms such as Taobao and Jingdong, you may find some sellers who may provide e-books or paper versions. However, it is recommended that you carefully verify the seller's reputation and evaluation before purchasing to ensure the quality and after-sales service of the book you are purchasing. I hope this information will be helpful to you. If you have any other questions, feel free to ask me.