Inspector Morse: Season 4, Episode 2

4 - 2: The Sins of the Fathers

Morse investigates the murder of Trevor Radford, managing director of the family-owned Radford's Brewery, who was attacked and killed while working late.
Morse becomes immersed in the implications of a hostile take-over bid by another company. Then Trevor's widow, Helen, goes to the brewery to look for his brother Stephen (with whom she was having an affair) and finds him also murdered.