Ellen Trawton is running away from it all. She hates her job, she doesn't love the aristocratic man to whom she is engaged, and her relationship with her controlling mother is becoming increasingly strained. So Ellen leaves London, fleeing to the one place she knows her mother won't find her, her aunt's cottage in Connemara. Cutting all her ties with chic London society, Ellen gives in to Ireland's charm and warmth, thinking her future may lie where so much of her past has been hidden. Her imagination is soon captured by the compelling ruins of a lighthouse where, five years earlier, a young mother died in a fire.

The ghost of the young wife, Caitlin, haunts the nearby castle, mourning the future she can never have there. Unable to move on, she watches her husband and children, hoping they might see her and feel her love once more. But she doesn't anticipate her husband falling in love again. Can she prevent it? Or can she let go and find a way to freedom and happiness?

The ruggedly beautiful Connemara coastline with its tightknit community of unforgettable characters provides the backdrop for this poignant story of two women seeking the peace and love they desperately need. For each, the key will be found in the secrets of the past, illuminated by the lighthouse.