This is a personal story of a multinational research programme that, instead of explaining conflict, has sought to explain peace, and to gauge its quality and sustainability. The Uppsala Conflict Data Programme has shown a dramatic drop in East Asian battle deaths between the 1970s and ’80s, just as wars got worse in the rest of the world. Since 1989, East Asia has been exceptionally peaceful. The book recounts heated discussions over how to explain a regional transition to peace