In 2013, four gunmen walked into a crowded shopping mall in Nairobi, Kenya and set about systematically murdering shoppers. The entire attack was recorded by more than 100 security cameras. Drawing on the thousands of hours of footage, this is the chilling and dramatic account of a terrorist attack that shocked the world.Featuring moving interviews with the men, women and children who came face-to-face with the terrorists and survived, such as Amber Prior. She had already been shot in the hip - and her two young children had witnessed people killed around them - when she made a remarkable decision to confront a gunman.As well as documenting the brutality of the gunmen from the Somalian group al Shabaab, who killed 67 people, the film charts the extraordinary bravery of the plainclothes police officers and civilians who risked their lives to rescue trapped shoppers.