Debutante in Disguise by Eleanor Webster

A society lady...with a secret!

Determined to help people, Letty Barton leads a double life - she's a trained doctor! No one must know 'Dr. Hatfield' is actually a woman. Called to an emergency, she comes face-to-face with her patient's brother, Lord Anthony Ashcroft! They'd once shared a spark-filled flirtation - now he's a brooding, scarred war hero. But how long will it be before he recognises her beneath her disguise and the sparks begin to fly once more?