This episode follows the team of four detectives working full-time on child abuse cases in the dedicated Safeguarding Investigation Unit at Luton Police Station. News spreads across the county about a suspected paedophile trying to abduct young children on their way home from school. Local press coverage has led to hundreds of calls from panicked parents to the police. With the culprit at large, cameras follow the Major Crime Unit as they lead the operation to arrest a third suspect following a nine-year-old girl's statement and an e-fit description. After two previous suspects have been released without charge, have they now got the right man? In the public protection unit, DC Annie Fowler and DC Selena Humphreys believe they have finally gathered enough evidence, including thousands of images and hundreds of videos of extreme child abuse, to ensure the suspect is remanded in prison pending a trial. Following his second arrest, he makes a frank and shocking confession. The detectives take this new information to the Crown Prosecution Service in the hope of preventing him from committing any more offences.