When young and beautiful Mary Molesworth is forced to marry Robert Rochford, widowed heir to the earldom of Belfield, she finds that her idea of love is not returned. Jealous, cruel and manipulative, Robert ignores her after she has provided him with a male heir, preferring to spend his nights with his mistress. Power-hungry, Robert builds up a reputation that sees him reach for the highest positions in Ireland. Caught in an unhappy marriage, Mary begins to grow closer to Robert’s younger brother, Arthur. Acknowledging their love for each other, they will risk everything to be together. But Robert’s revenge threatens their lives and tears them apart.
Will Mary and Arthur find a way to escape Robert’s clutches?
Based on real events, Heart of Stone is a tale of power, jealousy, imprisonment, and love, set in 1740s Ireland.