In the Library of Congress Classification system, there is no one place to find Monster Literature. Depending on what type of literature it is, example American Literature is PS, it could be anywhere in the library.
The best way to search is to use the Advanced Search in JETfind.
Class P: Language and Literature
The JET Library contains over 100,000 items, this includes not only books but videos/DVD's, instructional materials, and more.
From the Library homepage, simply type your title or keyword(s) into the box. Select "Library Catalog" from the drop-down menu then click the magnifying glass.
Note: For ebooks, it is best to select "Everything" from the drop-down as some ebooks are in electronic collections (Articles & more) and others are in the Library Catalog.
From your result list, find the book that you are looking for. Click on the Title - or Availability link of the book to see the full record. This will show you if the book is available, what collection it is in (circulating, reference, etc.) and the Call Number
Finding Books within the Library:
The search option you use will depend on what you already know: