This Volume One of a three volume set will study the books included in the Old Testament (OT) and consider other books that could have been included in it but were not. Each of the 39 books in the OT will be reviewed in detail, and it will be explained why they were included in the OT. Then the debate about the "extra" books found in Roman Catholic and Eastern Orthodox Bibles as compared to Protestant and Jewish Bibles will be addressed. Lastly, other books that some wonder why they are not included in the OT will be discussed. It will be explained why these books were rejected.