The Paladin by David Ignatius
When a daring, high-tech CIA operation goes wrong and is disavowed, Michael Dunne sets out for revenge.
CIA operations officer Michael Dunne is tasked with infiltrating an Italian news organization that smells like a front for an enemy intelligence service. Headed by an American journalist, the self-styled “people’s bandits” run a cyber operation unlike anything the CIA has seen before. Fast, slick and indiscriminate, they steal secrets from everywhere and anyone, and exploit them in ways the CIA can neither understand nor stop.
Dunne knows it’s illegal to run a covert op on an American citizen or journalist, but he has never refused an assignment and his boss has assured his protection. Soon after Dunne infiltrates the organization, however, his cover disintegrates. When news of the operation breaks and someone leaks that Dunne had an extramarital affair while on the job, the CIA leaves him to take the fall. Now a year later, fresh out of jail, Dunne sets out to hunt down and take vengeance on the people who destroyed his life.