The phrase "to discuss the book" means to talk or have a conversation about the book, sharing thoughts, opinions, questions, or ideas related to its content, characters, or themes. Full definition
A number of other questions asked if social was even important at all, or if you merely want to discuss books with like minded souls. (goodereader.com)
We also discuss books in other genres that are high on action and adventure thrills. (goodreads.com)
Before couples come to an enrichment event, encourage them to prepare by reading and discussing a book on growth approaches to marriage. (religion-online.org)