The face of drug use in America is changing. Fentanyl, a highly addictive opioid, is making its way into the bedrooms of teenagers, often with just a few text messages or a few taps on a smartphone. "Killer High: The Silent Crisis," explores the drug crisis and impact of fentanyl through the eyes of the families impacted by it, the law enforcement officers desperate to get it off the streets, and the medical professionals who must deal with its deadly consequences.