One day you were looking for a book to read in your grandfather's library. He has so many nice books and you always enjoy reading them. This time one specific book got your attention while you are browsing his collection. Opening the book, you flip through the first few pages and read the first few paragraphs. You realize that that it is about a legendary cave and you start remembering a certain one back in your childhood. However, you need further investigation that's why you took the book back to your room. Taking your own files, you started comparing your own discoveries to the ones in the book. During the next hour, you finally realize that the cave is right under your nose.
Your basement sits at a top of a cavern and you had payed there as a child. Soon it becomes your most important discovery yet as you go and finally explore it.