Fletch, sentenced to a five year stretch at HM Prison Slade in darkest Cumbria, is determined to keep his head down, do his time and not let the b****s grind him down. But it's not so simple when you're an old lag. His naive cell-mate Lenny Godber needs to learn the ropes, skives and scams, evil Prison Office Mr Mackay can't be allowed to run things his own way and warden Mr Barrowclough is just too weak-willed not to have his good-nature exploited.