Khalil Rafati went to Los Angeles in the 1990s and had it all. He was working with Hollywood movie stars and legendary rock musicians, but it wasn't long before he found his way into the dark underbelly of the City of Angels.When he hit rock bottom—addicted to heroin and cocaine, overtaken by paranoia and psychosis, written off by his friends and family—he grabbed a shovel and kept digging. At thirty-three, Khalil was 109 pounds, a convicted felon, high school dropout, and homeless...