"Name of the book set" (book_set_id)

Total: # files, ###.### bytes
Books:
Book 1 (755.555 bytes)
Book 2 (755.555 bytes)
Book 3 (755.555 bytes)

book_set_id_1.jar (### bytes)
  Book 1
    chapter....
    chapter....
    chapter....
    chapter....
    
  Book 2
    chapter....
    chapter....
    chapter....
    chapter....