Who Killed Cock Robin?

A pub owner calls on Barnaby when the local doctor Oliver Burgess thinks he may have hit someone while driving home and an Irish stranger apparently vanishes at the same time. Barnaby identifies the stranger as Sean O'Connell and then meets an old criminal acquaintance Melvyn Stockard who is now the squire of Newton Magna. Stockard claims to be a reformed man but he disapproves of his daughter's impending marriage and one of the wedding party is then found dead in a local well.