A fatal accident changes the destiny of two families when Elizabeth Lancaster's wish comes true and she receives the heart transplant she desperately needs. The operation leaves her physically healthy but emotionally estranged from her husband and children. When the husband of the woman whose heart now beats in Elizabeth's body, pays her a visit the two fall in love. Having betrayed her husband, Elizabeth must decide which of the two men she wants to be with. She must also contend with her brother, Richard, who wants to sell the family's centuries old cider farm to pay off his gambling debts. When an explosion rips through the farm one night she must fight for what she wants but at what cost? A gripping story of love and betrayal, but will Elizabeth be given a second chance with her 'Unknown Heart'?