I saw an unusual book: The foreword comes after the epilogue; The end is in the first half of the book; The index comes before the introduction. Name the book.

Why this works

This riddle plays with the structure and order of a dictionary compared to a typical book. In a dictionary, the "foreword" can be seen as the preface, which indeed comes before the main entries but conceptually follows the definitions found in the book. The "end" refers to the last part of a word, which often appears in the first half of many dictionary entries, as most words are defined from A to Z. Lastly, the "index" in a dictionary often refers to the alphabetical listing of words that is positioned before the definitions, making it appear before the "introduction" of the actual content. Thus, the answer cleverly captures the unique arrangement of a dictionary!