This week's case hits close to home for DS Matt Devlin when investigating the death of a police officer, and his best friend, PS Pete Garvey. Devlin and Garvey had known each other since childhood and when Matt discovers Pete had recently been in contact with their childhood parish priest Jonathan Nugent (Matthew Marsh), his suspicions are alerted as Pete claimed to have been sexually abused by him as a child. With nothing but suspicions and unfounded rumours to go on, a murder charge cannot be brought against Nugent. Now a married man with a family of his own, can Matt really be sure they've got the right man? James and Alesha take an unusual approach in order to bring a charge - any charge - against the accused in a desperate attempt to get the case home.

• Dick Wolf

• Benedict Wong
• Juliet Stevenson
• Holly Aird