Brethren by J. Grisham

Trumble is a minimum security federal prison, home to the usual assortment of relatively harmless criminals - drug dealers, bank robbers, swindlers, embezzlers, tax evaders, and three former judges who call themselves The Brethren. They meet each day in the law library where they handle cases for other inmates, practice law without a licence, and sometimes dispense jailhouse justice. And they spend hours writing letters. They are fine-tuning a mail scam, and it's starting to really work. The money is pouring in. Then, their little scam goes awry. It ensnares the wrong victim, a powerful man on the outside, a man with dangerous friends, and The Brethren's days of quietly marking time are over.

The novels shares us insights on how well one can make money even in jail. For a wise man, nothing is impossible if intelligence and wise ways can handle. But at the back of all these, there's the saying that evil never wins over the good. Do good and get no harm, while do evil and you'll end up either your life or in jail like what had happened in some characters in the novel.

Source: Alibris