Kenilworth

Kenilworth is apparently set in 1575, and centers on the secret marriage of Robert Dudley, 1st Earl of Leicester, and Amy Robsart, daughter of Sir Hugh Robsart. The tragic series of events begins when Amy flees her father and her betrothed, Tressilian, to marry the Earl. Amy passionately loves her husband, and the Earl loves her in return, but he is driven by ambition. He is courting the favour of Queen Elizabeth I, and only by keeping his marriage to Amy secret can he hope to rise to the height of power that he desires.
At the end of the book, the queen finally discovers the truth, to the shame of the Earl. But the disclosure has come too late, for Amy has been murdered by the Earl's even more ambitious steward, Varney.