Men are being lured to meetings with a couple who pose online as underage girls. After filming their public confrontations with their victims, paedophile hunters post the evidence online. They also demand that the men who they entrap hand themselves in to the police. Once the suspects are in custody the police begin a race against the clock to find the evidence to charge the men. Does the involvement of these modern-day vigilantes help the police investigation into potential sex offenders who lurk in our midst or does it risk undermining the prosecution against them? 24 Hours in Police Custody - the critically acclaimed documentary series with unprecedented access around the clock to the work of Bedfordshire Police - has returned with a new approach to their investigations into major crimes. Cameras follow each case in forensic detail as the officers race against time to disentangle who is responsible for the crime, then try to build a case and put it to their suspect in interview.