Tiring of his double life, William travels to Dublin for one last assignment: infiltrating a group of IRA supporters. But these "rebels" are not what he expected — and one of them, a firebrand named Adam with a past as painful as his own, shakes William's uncertain footing to its foundation. As the crisis in Dublin escalates, William treads a dangerous path between the violence in the streets, the vengeance of the Crown, and the costliest risk of all — falling in love with the man he was sent to betray.