Charity (The Distinguished Rogues #3)
Heather Boyd

Agatha Birkenstock was devastated by Oscar's betrothal and his offer of carte blanche broke her heart. Granddaughter to a wealthy cit, Agatha could never be happy as Oscar's mistress and vows to protect her heart. But when they're forced to work together to save her beloved orphanage from closure, she's hard pressed to keep a proper distance. Although few in society seem to notice, Agatha glimpses the suffering in his eyes and against all sense, risks her heart again. Yet even as she vows to uncover his secrets, Agatha's world is ripped apart and the scandal that follows damages more than just her tenuous place in society. It threatens to shred Oscar's family apart.
A sizzling regency romance novel.