Detectives continue to investigate the murder of young homeless man Daniel Smith in the city centre. A man who has been arrested and brought in for questioning says he was in the arches on the night of the murder and has information regarding others who were there at the time. Meanwhile in Bolton, Greater Manchester, a local man has gone missing and rumours in the community suggest he has come to harm. DCI Sarah Jones is assigned the case and, as an extensive search is underway, information comes in which leads detectives to fear the worst. As the team tries to pinpoint the missing man's last movements, phone data leads them to the last person they believe he was with on the day he disappeared.