Jack Meadows arrives to take charge of Sun Hill CID. He becomes involved with a father suspected of murdering his drug addict son.

Petal Ford is knocked out just outside a known drugs den. When Leon attends the crime scene a man trying to help her runs off. After Mickey questions her he is not convinced she is telling the truth. The man who was helping her is identified as Ben Meadows, Jack's son, who has just been released from jail. Ben does not want Mickey telling his father after he admits that he is Petal's boyfriend.

Jack thinks that his son has lied to him following the failed drugs bust. After talking to Sennett in hospital though he finds out that Ben actually tried to help the police. Petal calls the police when Linton Barry tries to break her door down. When Jack shows up he finds out that his son is OK but Petal has been taken hostage.