1978: Temperatures are flirting with 90 on an August day when 18-year-old Mira Winston drives a golf ball from her tee toward the practice net near the clubhouse and caddy shack. The golf ball tears through the net, traveling 150 miles per hour, and slams into the temple of high school junior Kenny Foster, rupturing an artery and unleashing a torrent of blood. He’s dead before the ambulance even arrives. In the wake of this terrible accident, Mira looks for comfort in all the wrong places. But when the investigators look more closely at the torn net, when a detective recalls Mira’s history of recklessness, and when Kenny’s father spies Mira with her married lover, the affluent and mannered community turns on this once-promising young woman.