Fletcher is having a spell in the prison hospital with a broken ankle. He's sharing a ward with old Blanco, who tells him that another inmate has swindled him out of his belongings in a crooked card game. Fletcher hatches a plan to recover Blanco's belongings and to take revenge on the culprit.

Godber takes up boxing and wins a place in the prison championship, so Fletcher sees a chance for a bit of a flutter. Then Harry Grout takes an interest and insists that the fight is 'fixed'. When one of Grout's rivals takes a similar interest in Godber's opponent, it looks as if nobody can win. Fletcher, however, has other ideas.

When a bottle of pills goes missing from the Doctor's surgery, Harry Grout is worried that investigation of the theft by the prison authorities will jeopardise some of his activities. Grout insists that Fletcher must find the pills and return them before the warders can take action.