"Signet Select historical romance" -- Spine

"All Emily Selwick wanted was to convince the man she had adored for years that she was the woman he ought to marry. She never expected that her ill-fated deception at a party would uncover a scheme against the Crown and ensnare her in the sensual trap of an enigmatic stranger. Damien Boscastle, the Earl of Shalcross, knows he must marry Emily to defend her honor and keep his mission secret. But, by saving her reputation, he will draw her into his arms as well as a dangerous intrigue. After a whirlwind courtship that leaves her breathless, Emily finds herself wed to a husband who vows not only to protect her from his menacing world, but to train his wife in the pleasures of passion." --,(Source of summary not specified)