This chapter discusses reconstruction Theology in Action by examining the significant theological contributions of J.N.K. Mugambi’s Theology, notably the theology of reconstruction through a case study of Nairobi Chapel/Mavuno Church in Nairobi, Kenya. This participant observation approach opens opportunity to revisit the prophetic call of the theology of reconstruction and delineating how this is carried out in the Nairobi Chapel/Mavuno Church which provides the data for this analysis. The author concludes with a reflection on the relevance of reconstruction theology for African and World Christianity.