Like Chris Atkins in the non-fiction A Bit of a Stretch the protagonist is a white collar educated inmate, but Malcolm Bannister finds a different way to get out of jail. In both cases there is a mixture of prisoners who fell afoul of the law once, and those who have been, and are likely to continue to be repeat offenders. Rehabilitation is not mentioned (It would not fit the plot in this case,but in a wider context I am wondering if there are other possible upbeat ways to exit the prison system)