Gilbert Markham is deeply intrigued by Helen Graham, a beautiful and secretive young woman who has moved into nearby Wildfell Hall with her young son. He is quick to offer Helen his friendship, but when her reclusive behaviour becomes the subject of local gossip and speculation, Gilbert begins to wonder whether his trust in her has been misplaced. It is only when she allows Gilbert to read her diary that the truth is revealed and the shocking details of the disastrous marriage she has left behind emerge.