Grisham has to be one of the most cynical authors writing legal fiction today. Everyone is corrupt, thinking only of himself, and money rules.The "Brethren" are three ex-judges who have been incarcerated in a minimum security federal prison for a variety of avaricious crimes. While in prison, they procure the services of Trevor, a greedy little lawyer who agrees to act as the go-between in a dirty scheme to extort money from gay men who are fearful of being outed. Trevor bribes the prison guards to look the other way while he "smuggles" in forbidden documents and deposits their ill-begotten proceeds in an off-shore bank account. It's all very sordid.
A subplot, that becomes mixed with the affairs of the Brethren concerns Teddy Maynard, director of the CIA, who, appalled by the fall of communism and the concomitant reduction in military spending, conspires to find a candidate of suitable malleability, whom he can groom to be the next president. Aaron Lake, handsome, widowed, a light drinker, with no political baggage, seems the perfect choice. Just to be on the safe side, though, Maynard has Lake followed everywhere. By instigating terrorist actions at the appropriate time, and collecting huge amounts of money from weapons manufacturers who stand to reap huge profits from Lake's sole campaign promise: to double the defense budget; Maynard assures that Lake soon has a commanding lead over the vice-president, the previous front runner. Maynard will stop at nothing, including orchestrating a murder, to realize his dream of controlling the president.
While following Lake, Maynard's agents discover he has a PO Box hidden away. They "borrow" the mail - notice the CIA has already been involved in several gross violations of the law, all in the name of national security - and discover to their horror that their "perfect" candidate is conducting a surreptitious correspondence with a young man looking for a wealthy male gigolo. We know that the young man, Ricky" is really the creation of the Brethren. The Brethren, always careful, learn who "AL" really is, and see a huge windfall in the making. What better extortion candidate than someone running for president. Soon they realize that there is a third party involved, a very powerful group of men, but they are determined to make the most of the situation. The ending, which I won't reveal, is less a blockbuster than a revelation of Grisham's sordid view of the world.