The Risk of Rogues by Sabrina Jeffries

Lady Anne is shocked when Captain Lord Hartley Corry—her former fiancé who left for India after her father forbade their marriage—returns to England and acts as if everything is all water under the bridge. He never fought for her hand or eloped with her as he promised and he thinks she’d still be willing to marry him? Not a chance.

Hartley is equally shocked to literally run into his past love upon arriving at his brother’s house. Though he yearns to take advantage of this second chance to woo his beloved, he can hardly admit that he is secretly a spy—at least not until he can be sure he trusts her. But convincing Lady Anne to let him prove his sincerity by courting her respectably all over again might be his undoing. Because all he wants is to show her how much of a rogue he can be when the right woman is in his arms…