Athena’s Revenge by M Bonneau

Catherine Hunt enjoys her independence. She no longer needs to marry a man she doesn’t love to save her family from the poorhouse and is planning a life of happy spinsterhood. But then the man she hates most in the world, the man who nearly destroyed her sister, is left for dead practically on her doorstep, and she finds herself saving him. A swift death is too good for him, after all. He has to live so he can make amends.
Oliver Reid, Viscount Grenville, didn’t realize until he almost died how empty and pointless his life was. Then, a vengeful angel saves him and he finally has a purpose. He will make right his wrongs and prove to Catherine that his jaded heart is capable of love. But it’s a more difficult task than he anticipated. It turns out he’s never been the hero of his own story. He’s been the villain, and Catherine may never forgive him. He may never forgive himself.

How can he be worthy of Catherine, how can he expect her to love him, when he represents everything she hates?
And then there’s the reason he was shot in the first place: the woman he dueled over, whose reputation can only be saved by marriage… to him.