It is now two years ago that a two-year-old boy in Guinea called Emile caught the deadly Ebola virus and died. In next to no time the disease then spread to the neighbouring countries of Sierra Leone and Liberia. So far, it has infected 25,601 persons and led to 11,300 deaths in the three countries. But these are only the official statistics – the true number of victims is thought to be considerably higher. How could the crisis assume such dramatic proportions? The authors in this edition give accounts of their analyses on Ebola outbreak and response, but also of their personal experiences during their work in the countries concerned.