Paul's son Marty gets caught up in an accidental shooting which results in the death of local farmer Hilton. Matters are further complicated when Joanna misdiagnoses the Keen's colicky baby whose father, mentally ill Roger, is the man who worked for the deceased Hilton and whom DI Jackson suspects of the killing.

Later, Paul and Ken Jackson are furious when they learn of Marty's involvement in the accidental shooting because Roger Keen is clearly volatile and mentally unstable. Whilst in police custody, Roger's baby son is rushed to hospital and is taken to see him. Back at the police station he has a relapse and is committed again, despite being cleared of murder. Paul returns home to confront Marty and in the heated row that follows, Marty blames him for killing his mother Celia! Joanna calls round and has a go at Dangerfield for getting involved in the baby case and refuses his invitation for a drink to talk about it.