As a rule of thumb, you cannot possibly know what has and has not been done in a scientific area if you are not part of this scientific area. @xLeitix offered his suggestion about linguistics and his suggestion is good. So, search there, ask specific people about this, read the accompanying textbooks first and then focus on recent papers. It is very hard for an amateur researcher to think of something that has not been done before. It might happen occasionally but it is not that common.
Also you need to consider, that if there is not a scientific area about what you want to research, it might mean (again it is not 100% sure) that what you are suggesting is not that interesting after all. Why e.g., focus on a specific book for example and not on all books written by the same author? What are you hoping to achieve and why does it matter? These are questions that need to be answered before starting the actual research.
So, initially I would try to identify and align my research agenda according to the greater scientific area most close to my scientific interests. Once, you get a good grasp and knowledge of this specific area, you could then try to form your individual research and find what differentiates your work from the rest of the bunch. Identifying the area is a very major step, because otherwise even if your work is seminal you still need to find a journal that would publish your work. And without knowing where to publish it would be very hard to disseminate any scientific work.