In a quaint coastal village in France, a young English woman finds herself captivated by the charms of a French cavalry officer. Unfortunately, their passionate love story takes an abrupt turn when she is abruptly sent back to England to complete her education in a convent. Simultaneously, her paramour is unjustly accused of espionage by a rival officer, leading to his imprisonment on Devil's Island. As she resumes her life in England, she eventually enters into a comfortable and respectable marriage with a wealthy Englishman.
A decade later, her tranquility is disrupted when she faces the threat of blackmail. In a surprising twist of fate, her former lover manages to escape from Devil's Island to rush to her aid. However, the toll of his time in the penal colony has left him seriously ill, and tragically, he succumbs shortly after reuniting with his lost love.