Unseen Enemy is an essential ex loration of reasons 21st-century o ulations are ex eriencing a rash of diseases that were once only outbreaks, but have now become full-blown e idemics. This increased risk that we face, and the ways society and individuals can work together to reduce that risk, are ex lained to the ublic through the case studies of three e idemics: Ebola, influenza and Zika. Moving across the globe, we meet doctors, disease detectives and everyday eo le who have ste ed into the horror of an e idemic and emerged dee ly changed. E idemics bring out the best and worst of human behavior, with effects reaching far beyond the tolls of sickness and death.