Someone is holding her brother prisoner in exchange for a gold-and-onyx box covered in mysterious runes, so Mary Hurst boldly sets out from the family vicarage to find the priceless artifact. But the man who possesses it, Angus Hay, the Earl of Erroll, is less than sympathetic to her plight. Himself a prisoner of his dark past, Angus refuses to yield the box - or allow Mary to leave! Suspicious of the alluring lass's mission, he vows to wrest a confession from her, but unearths a fiery temper and a will as strong as his own. Passion flares between them, but now there is more at stake - an unknown enemy is hunting down the precious box, and will stop at nothing. Risking all for love, Angus must solve the mystery behind the runes... and trust the only woman who can awaken his forgotten heart.