Spinster Eden Beckett has a full life with her
gardening, painting and keeping an eye on her willful younger sister
Zoë. Into her world comes Seth, adopted son of the Duke of Derwent,
looking for a bride for the duke’s son. Though passions ignite between
Seth and Eden, each must obey a primary duty. And Eden will protect her
sister from the rakehell marquess if she can. Regency Romance by Anne
Barbour; originally published by Signet
I have not yet read this one, but I have met the author and have heard her read some of her other writing. I love it all and this one (and all the other Anne Barbour titles) are on my To Be Read list.