Joy Ogilvie, the beautiful young daughter of a Kentucky colonel, plays a joke with her friends, pretending to be "Lady Athlyne", after hearing a story about the dashing Irish nobleman Lord Athlyne. Little does she know that half a world away, the real Lord Athlyne is a prisoner of war in a South African camp, where word reaches him that a woman in America is impersonating his wife.

Upon his release, he decides to investigate the situation and travels to New York, where a near-fatal accident introduces him to Joy and her father. Athlyne and Joy fall instantly in love-but a series of misadventures and dangerous obstacles threatens to prevent their marriage. And when Colonel Ogilvie learns of their affair and challenges Athlyne to a duel to the death, their love just may end in tragedy!