Not Your Average Earl (The Curse of the Weatherby Ball #3)
Eliza Lloyd

Rose Stewart has an unnatural attachment to the child. And she has a valise full of secrets. Like being the duke of Murton's estranged granddaughter. It's not as if she lies, she just omits telling the truth.
Her troubles entangled Leo in a battle of wills, a determination to return her to her rightful place in society and the silent struggle of denied feelings.