Known as "L'Un," Alain Hartfield is the bane of the French government. Wanting to do his part in the fight against Napoleon, the young Baron devotes himself to rescuing families persecuted under the new regime. He knows it is dangerous to involve emotions in matters that require a clear head. But when he catches sight of the stunning violinist, Cecile Duvalier, while infiltrating the circles of one of Napoleon's premiere generals, Alain is smitten beyond all logic.

The attentions of the general's new aide-de-camp are an unwanted complication for Cecile. The more she learns about him, the more she becomes convinced that he is L'Un. Against her better judgment, she finds herself falling in love with the dashing blond gentleman. When Cecile overhears plans to trap L'Un, she risks her own life to warn him and ensure his escape.

Learning of Cecile's imprisonment and execution for treason, Alain is devastated. He returns to England and takes up the reins of his estate. Hope soars when he learns of a violinist performing in London. On a whim, he journeys to London and discovers Cecile lives. But their joy in finding one another again is dimmed by a vicious rumor--that the person who attempted to betray L'Un is Cecile Duvalier. The rumor casts a dark shadow over their engagement and Alain must choose between trusting the woman he loves or living without her.