Harlan Coben's The Stranger

The Stranger follows Adam Price as a secret destroys his perfect life, sending him on a collision course with a deadly conspiracy. Price has a good life, two wonderful sons, and a watertight marriage, until one night a stranger sits next to him in a bar and tells him a devastating secret about his wife, Corinne. Soon Adam finds himself tangled in something far darker than even Corinne's deception, and realizes that if he doesn't make exactly the right moves, the conspiracy he's stumbled into will not only ruin lives—it will end them.