The four girls were from a group of around 270 (not part of the more widely publicised group of 200) kidnapped from their boarding school in the predominantly Christian town of Chibok in Borno State, Northern Nigeria in April this year. They were helped to escape by a fellow prisoner, a teenage boy. They walked west for more than three weeks, guided by the setting sun, until they arrived in a Nigerian village. They were starving and traumatised on their arrival.