There is no book or material currently needed other than the couples and their bibles. The group is currently in the book of Matthew and the group is LOVING it. We have them read 5 chapters every week together and then discuss in depth what they feel like God was showing them. The biggest thing this group is doing is learning to read the bible together as a married couple. This also makes it easier if another couple wants to join mid study. They don't have to worry about getting a book or feeling lost because they are jumping in - in the middle of a study.