Synopsis

When Steve McAndrew’s teenage son, Stewie, is arrested for drug possession, he's confronted once more by his ex-wife, Tricia, as they struggle to pull him back from a dangerous decline. Meanwhile, the team investigates after a confused dementia patient flees her care home, claiming to have witnessed a murder – an incident that leads them to examine the disappearance of a police officer, possibly murdered and missing since 1956.