Bill Browning heads the trauma unit at San Francisco's busiest emergency room; Stephanie Lawrence is a rising star at her teaching hospital; Harvard-educated Wendy Jones is a dedicated trauma doctor at Stanford, and Tom Wylie's popularity with women rivals the superb medical skills he employs. They are chosen to work with their counterparts in Paris in a mass-casualty training program. When an act of mass violence galvanizes them into action, it becomes a time to face harder choices than they have ever made before.