The Lady Hellion (Wicked Deceptions)

Lady Sophia Barnes doesn't take no for an answer. Especially when she's roaming London's seedy underground...dressed as a man.
 
A rabble rouser for justice, Sophie's latest mission is to fight for the rights of the poor, the wretched--and the employees at Madame Hartley's brothel. She's not concerned about the criminals who will cross her path, for Sophie has mastered the art of deception--including the art of wearing trousers. Now her fate is in her own hands, along with a loaded gun. All she needs is instruction on how to shoot it. But only one person can help her: Lord Quint, the man who broke her heart years ago. The man she won't let destroy her again...
 
The last thing Damien Beecham, Viscount Quint, needs is an intrusion on his privacy, especially from the beautiful, exasperating woman he's never stopped wanting. A woman with a perilously absurd request, no less. For Damien is fighting a battle of his own, one he wishes to keep hidden--along with his feelings for Lady Sophia. Yet that fight is as hopeless as stopping her outlandish plan. Soon all Quint knows for certain is that he will die trying to protect her...