A Wicked Scheme: A Mystery Romance "Pride & Prejudice" Variation

Blackmail leads to an unlikely partnership. When Fitzwilliam finds Lizzy waiting in his carriage with a pistol aimed at him, they quickly discover they both have a mutual problem. Their sisters' indiscretions are being used by someone to extort their families, so they decide to work together to learn who is blackmailing them. At first, they argue and have nothing in common, but he starts to see more to Lizzy than her fine eyes.
Fitzwilliam is falling in love with her, but she resists his efforts because he objects to Jane's seemingly shallow affections for Bingley. How can he allow an ill-suited match for his friend even if withdrawing his objections is the only way he can convince Lizzy to let him court her? Can he sacrifice his own happiness for his friend's sake?This is a SWEET JAFF with a mystery for ODC to solve as they find a way to get past their prejudices against each other.