Seán MacDíarmada moved in the shadows, ultra-cautious about what he committed to paper, aware that his letters could be intercepted by the police. Because of this, history has not allocated MacDíarmada the prominent role he deserves in the organisation of the Easter Rising.This book gives Seán MacDíarmada his proper place in history. It outlines his substantial role in the detailed planning of the Rising, which led to him signing the Proclamation of the Irish Republic: second only to Tom Clarke.