The Missionary & The Mercenary is a story intertwining history, suspense, and a love story with a dash of religion and family. When Father Brennan and Sister Monica are captured, their captors notice the bond between them, and devise a plan to force information from the two of them. During the interrogation, Father Brennan has no choice but to keep their secret at the expense of his sanity, resulting in Sister Monica being sadistically tortured in a ritualistic way, and leaving Father Brennan with an unbearable guilt that he carries with him long after they've both returned safely home to Ireland. Can Sean forgive himself or will he commit the ultimate sacrifice to end his torment?