A remarkable four-year investigation into the dangerous world of synthetic drugs—from black market drug factories in China to users and dealers on the streets of the U.S. to harm reduction activists in Europe—which reveals for the first time the next wave of the opioid epidemicA deeply human story,Fentanyl, Inc. is the first deep-dive investigation of a hazardous and illicit industry that has created a worldwide epidemic, ravaging communities and overwhelming and confounding