When Dr Jack Hunt moved from his native Dublin to a new job at a top Chicago hospital he hoped it would herald the career breakthrough he needed. But despite his groundbreaking research in cardiology, Jack is frustrated at every turn. Then his boss is shot dead - in his office. The bloody event horrifies the city. Little does Jack know that the bullet was meant for him. Somebody, somewhere, wants him dead. And when he is promoted into the dead man's job, not only his life but those of his wife and young son are at risk. Tension mounts to force Jack from his post - and to force him to fight back. Slowly uncovering a terrifying tale of corruption, Jack finds himself on the run, culminating in a heart-stopping chase across the breadth of the country...