Blue Skies by Mary Lancaster

A girl called Hope…

Returned to England after several years, the eccentric young Duke of Oatland has many reasons to seek seclusion. But the mud-covered girl at his front door is like a breath of fresh air. She doesn’t care who he is. She stands up to him, tells him off, and laughs with him, until he begins to see the beauty of the English summer.
When Cousin Hadrian arrives, uninvited, he tries to bring the duke out of his self-imposed shell. But is Hadrian really looking after him?
.
Or is his purpose, as Hope suspects, more sinister?