"Author Canning, a paramedic from Hartford, CT, writes about working on the front lines of the opioid epidemic in the United States. Canning takes readers on ambulance rides to the scene of overdose cases. His descriptions of what he finds there are vivid, disturbing, and moving. He explains his own transformation from someone with contempt for addicts to someone with sympathy for them, given what we now know about opiates' effects on brain chemistry....