When Shirley is involved in a minor car accident, Frank hounds her for a breath test but she resists on principle, insisting an erratically driven bus forced her to swerve into the other lane. Brendan Jones saves a young asthmatic's life but the boy's overprotective mother takes offence at Brendan's suggestion that she is contributing to her son's dependency. Molly gets a new dog, Fang, but a rash of animal poisonings has her worried.