On the eve of the Edinburgh 2010 celebrations, "Joining in with the Spirit" makes the connection between mission as the work of mission agencies overseas and mission as the activity of a local church. It shows how, through the global flows of scholarship, missionary movements and migration, mission initiatives in different parts of the world impinge on the churches in Britain, which are but part of a world church. This publication is an accessible introduction to mission studies - the history, theology and issues of mission, which is up-to-date and supported by contemporary scholarship. It also offers a theological framework for mission, which applies both globally and locally, to help the reader discern the movement of the Spirit of Christ among the many other spirits of this world. This text illustrates the impact of the 1910 Edinburgh world missionary conference and shows how the churches in Britain as a part of a much wider movement of the Spirit of Christ that is world Christianity.