In this episode, Fletcher and some of his fellow prisoners are allowed out for the day to dig drainage ditches for the local council, only for mishaps to soon occur.
Later that morning, while the men are digging at the side of a local road, Mackay leaves Barrowclough in charge while he heads off in the prison van to run an errand in the nearby village.
As the men prepare to head back to work, the group find they have been locked inside, as the verger was unaware of their presence within.
The men swiftly try to get out fast, and manage to return to the ditches, ensuring Barrowclough is not reported for the mishap, while making Mackay look very foolish when he fears that the prisoners had escape and calls in for help.
That evening, Mackay warns Fletcher that he will be keeping an eye on him, resenting that he was made to look a fool in front of his superior.