When are interventions appropriate? Diana Sylvestre, a renegade doctor in Oakland, disputes current approaches to two major medical epidemics: the liver-destroying virus hepatitis C, and its outcast counterpart, addiction. At the Oasis clinic, this maverick doctor and her ragtag clientele - a small army of drug addicts - are (loudly) trying to change the rules of "intervention." This is the astonishing story of how they arrived at their strategy, which threads medical science with a deeply counterintuitive approach to addiction.