I hate to do this to y'all, but the most important thing I think you need to know about this story is also a spoiler. It's hinted at but you don't learn the truth until around the 70 or 80% mark, but I MUST say it because, well, if you read the spoiler you'll understand.
THEY HAVE THE SAME GREAT-GRANDFATHER. I think the author said it made their relationship second cousins (she also added a "once removed" but the character that said it made it sound like she wasn't sure). I'm sure this is fine for some but for me,
It's talked about how the heroine looks exactly like the great-grandmother at that age and all the talk of similarities was too in the family for me.
Moving on, the spoiler basically just put a cherry on what I would call a meh book. If you're looking for a clean read, this would be for you but also be aware the romance is slow and meandering. I liked the heroine and hero together but while at times they had chemistry, their dialogue could also be a bit stiff. This is a Mills & Boon and it comes with the more stiff upper lip reserved story and characters.