Walking on Water: Part 1 (S03E03)

Boyd and Silver find themselves involved in a cold case when Frankie gives evidence at the appeal for convicted killer Mark Lovell. Eleven years ago, Mark was jailed for the murder of his adopted father, Thomas Lovell. Neither the family's fishing boat nor Mark's mother, sister or niece have been seen since his father's death. Boyd believes the only way to find the true identity of the killer is to discover what happened to the rest of the family, but when he goes to question Mark he finds a very different man to the one who went to prison, and is forced to confront his own prejudices. (iTunes)