A powerful retelling of the 2017 terrorist attack for BBC2. On 22 May 2017, a Manchester-born man detonated a homemade bomb at an Ariana Grande pop concert, killing 22 people and himself. It was Britain's deadliest terrorist attack since 7/7. The documentary tells the story of that night in forensic detail, through the eyes of teenage girls who survived the attack and key members of the emergency services. It features unseen mobile phone video and unheard audio recordings. The film also explores the identity and motives of the suicide bomber. Featuring interviews with counter-terrorism police and Manchester residents, the film sheds light on what may have led Salman Abedi, a 22-year-old Manchester boy of Libyan parentage, to target a group of children attending a concert celebrating the independence and empowerment of young women.