The Singer's Gun by Emily St. John Mandel

Everyone Anton Walker grew up with is corrupt: his parents dealt in stolen goods, and his first career was a partnership venture with his cousin Aria to sell forged documents to illegal aliens. By his late twenties he had escaped, and now he's living a satisfactory life as a successful middle manager . . . until Aria begins blackmailing him to do one lastjob that will have profound and unexpected repercussions. As Anton's carefully constructed life begins to disintegrate around him, he's forced to choose between loyalty to his family and his own desires.