In the high-security environment of Belmarsh Prison, a group of diverse recruits undergoes intensive training to become prison officers. As they navigate the challenges of maintaining order and security, they must confront their own biases and learn to handle the complex, often volatile, realities of prison life. The film offers a raw and unfiltered look at the demanding nature of the profession, highlighting the intense pressure and emotional toll it takes on those tasked with guarding some of the country's most notorious criminals.