The action-packed page-turner follows the life of Mark Northfield, operating as a lone mercenary employed by a shadowy organization. His only comfort is the memory of his dead wife, and he lives by two final promises to her: never let go of life, and never let the world turn him into someone worse than the man she married. When a vengeful adversary blackmails Northfield into an assassination mission, his hope of keeping both vows shatters. If he refuses to complete the mission, he faces execution. He must either accept his death or corrupt himself. More lies in his decision than the state of his soul. Unknown to him, his target holds the key to saving the world.