The Apostle - Brad Thor

A new administration and a new approach to dealing with America's enemies have left covert counterterrorism operative Scot Harvath without a job. But when American doctor Julia Gallo is kidnapped in Afghanistan, the terms of her ransom leave the president with only one course of action.
Every politician has a secret. And when the daughter of a politically connected family is kidnapped abroad, America's new president will agree to anything--even a deadly and ill-advised rescue plan--in order to keep his secret hidden.
But when covert counterterrorism operative Scot Harvath is assigned to infiltrate one of the world's most notorious prisons and free the man the kidnappers demand as ransom, he quickly learns that there is much more to the operation than anyone dares to admit.
As the subterfuge is laid bare, Harvath must examine his own career of ruthlessly hunting down and killing terrorists and decide if he has what it takes to help one of the world's worst go free.