TARIFA, Spain — Mercy lay motionless on the bed, afraid to move as the stranger pulled up his trousers and refastened his belt. Even after he left, she remained frozen. An hour passed. Then another.…

Through the rearview mirror, Alma watched the blue and red lights flash across her young son’s worried face. As the police officer approached her car, panic set in. She didn’t have a driver’s license. She…