Episode 3 (S01E03)

After Guy and Amanda ask Sidney to perform their wedding ceremony, the heartbroken vicar fights to maintain his duties and remember his purpose. His vow to stay away from criminal cases and whiskey doesn't last for long, before a local pair of sisters mysteriously dies. With evidence of poisoning and the evidence pointing to Grantchester's new man in town, Sidney and Geordie must sift through layers of domestic discord and ethical uncertainty to find truth amongst the lies. (PBS)