Heiress in Exile (Misplaced Heiresses #3)
Cecilia Peartree

The other traveller is Lord George Marshall, brother of an Earl who resides mainly in Sussex. George cannot quite understand how he has come to be the only member of his extended family who is at leisure to undertake the journey, but after initial protests he has agreed to review the state of things at his uncle's property, aptly named Goose Chase.
Following an awkward encounter involving an unwieldy curricle, a loose horse and a child falling into the creek, the two exiles form an alliance against both Fate and the more tangible threats they encounter during their Cornish adventure.
This is the story of a younger son who is forced to take responsibility for perhaps the first time in his life, and of a daughter who believes she has been cast adrift to find her own way in the world. Elements of history, adventure and romance are woven into the story.