The book examines missions in both the OT and NT. Under this motif, the authors bring all the relevant passages to bear and challenge the NT Christian in his responsibility to under missions.
I gave it four stars because there some scriptures in the OT which I felt the authors were straining in order to fit their scheme (A danger that is always present when one is doing Biblical Theology.) One of my main points of disagreements was whether Israel was commanded 'to go' or 'to be.' The authors try to make a case that Israel had a similar mandate to the Church to go. I think the authors reach this conclusion because of their covenant theological perspective. It seems to me that Israel had a limited mandate and that the Church has a more comprehensive mandate than Israel. Israel was to be different so as to attract the nations, the Church is not only suppose to be different, but is also distinctly commanded to go and share the gospel.
Other than that, a great book on missions.