The Sister and the Surgeon — Lynne Collins

Ruth Challis has become a ward sister at Hartlake Hospital exceptionally young. Dedicated to nursing, a good reason to guard her heart, she keeps every man at a safe distance, particularly the handsome consultant, Oliver Manning, whose reputation does not encourage her to trust him.
Imagine her surprise, then, when he begins to chase her and her sheer amazement as she becomes aware of her cold heart melting towards him. But simplicity has never been a hallmark of Sister Challis's life, so when her old friend Daniel begins to play a far more significant part in her affairs then he ever has before, the complications multiply thick and fast…