The new run of the UK’s biggest and most successful true crime documentary series continues, with unprecedented behind-the-scenes access to police investigations into major crimes. Holding the Baby, the last programme in the current series, features police investigations into one of the most disturbing and hardest-to-prove crimes in modern policing. A 999 call alerts the authorities to a baby who is in a critical condition. Whenever a baby is taken to hospital with unexplained injuries, the police are called to investigate whether there are suspicious circumstances. Once the police arrive at hospital, they don’t allow the parents to leave their sight as they closely monitor their behaviour around the child. Detective Martin Hart is called to investigate; he only recently joined Bedfordshire Police’s specialist child abuse unit, CAVA. He admits it’s a tough job: ‘you don’t want dwell on it, but you do’. His work in the unit is very different to the high-profile crimes that he previously investigated, and he says: ‘you have to assume the child will die; you have to treat it like a murder investigation’. He’s aware that the challenge is especially difficult when the victim is a baby, and there are no other witnesses to the injury. He knows he will need the parents to reveal the truth about what happened and that, no matter what he suspects, if they stick to the same story or refuse to comment he will struggle to find the evidence to charge. Just two weeks later, another 999 call is received for a baby with life-threatening injuries. Cameras follow every twist and turn of the story as detectives use novel methods to probe the stories of the parents, as they seek to piece together exactly what really happened behind closed doors. This real-life drama explores the often-divided loyalties of parents as the officers investigate their baby shaking case.