The Queen and the Knave by Sarah M. Eden

Romance and mystery come full circle in the fifth and final book of Sarah M. Eden’s best-selling Victorian Proper Romance series.

London, 1866

Móirín Donnelly has spent the last five years working in the shadows for the Dread Penny Society, a secret fraternity of penny dreadful authors who use their profits, influence, and street smarts to protect the poor and vulnerable of Victorian London. But spending so much of her life in secret is taking its toll on her soul—and her heart.
When members of the Dread Penny Society begin disappearing, Móirín turns to her friend Detective Constable Fitzgerald Parkington for help. The two have developed a friendly rapport, and Móirín feels like she can trust him, though perhaps not with all of her secrets.
Fitzgerald Parkington has a sixth sense when it comes to tracking down criminals, which is why he’s recently been transferred to the Detective Department at Scotland Yard. But when roadblocks and red tape keep him from tracking down the criminal mastermind known as “The Tempest,” he must rely on the one woman who has unexpectedly captured his heart—the brash, bold, and fiery Irish lass, Móirín Donnelly.
As the Tempest’s deadly reach threatens to overwhelm all of London, Móirín and Fitz are caught in an elaborate game of cat and mouse that leads down back alleys, through dark London buildings, and right to the gates of Kensington Palace. Móirín has one chance to save Fitz and the Dread Penny Society from the Tempest, and she might have to sacrifice her one chance at love to do so.