The murder investigation reaches a climax as Rob and DI Hartley finally have some information that might lead them to the killer. Sid has to uncover why a young girl is averse to injections.

Sid is worried about Princess, while Al's plan to take Eve home goes unexpectedly awry. On the day he's due to receive a commendation, Sergeant Liam Walsh finds himself re-evaluating his job, with far reaching consequences.