Gabriel is a mutt basically by being half English and half American. With his newly acquired title though, he is sickened but the sudden mob trying to get him to marry their daughters. It makes it hard for him to trust a woman's intentions.
Amelia has an unfortunate past with her mother death and she has to care for her paranoid father. She feels stuck because of her situation and thus decides she cannot marry.
Through some self defense classes and quite a lot of adorable teasing the two find they care for one another. It was very sweet.