A Knight and His Rose — Catherine Kean

When Lady Violetta Molineaux is injured falling into an underground tunnel, she's rescued by her enemy, Lord Osric Seabrook. Afraid to reveal her identity to him, Violetta maintains her ruse of being a commoner. Yet, when she and Osric discover a secret in the tunnel, one that involves the rare blue rose, they must acknowledge shocking truths that could change their lives forever.