Anne Cartier, a teacher of the deaf, accepts an offer to help a deaf child whose governess died in a fall down the stairs of the family's palatial mansion. Anne suspects the death might not have been an accident and begins to investigate. She is aided by her friend and suitor, Paul de Saint-Martin. They believe the young woman's death may have been the work of renegade French army officer Captain Fitzroy, already accused of a brutal rape in Paris...