Does a Christian movement born in the nineteenth century still have a future? Patrick Nachtigall sets out on a journey to see how the Church of God (Anderson, IN headquarters) is facing six critical challenges. Nachtigall treks to six different continents to talk with Church of God people, seeking to understand the realities they face in the twenty-first century. Here is a picture of a very diverse movement which Nachtigall finds is filled with holiness but desperately lacking in unity. So its future is an open question. "Mosaic" is for anyone who wants to understand macro trends that affect not only the Church of God but the church worldwide.