The Brethren by John Grisham

They call themselves the Brethren: three disgraced former judges doing time in a Florida federal prison. One was sent up for tax evasion. Another, for skimming bingo profits. The third for a career-ending drunken joyride.

Meeting daily in the prison law library, taking exercise walks in their boxer shorts, these judges-turned-felons can reminisce about old court cases, dispense a little jailhouse justice, and contemplate where their lives went wrong. Or they can use their time in prison to get very rich—very fast. ...