The Secrets He Keeps by Amy Sandas

A fearsome woman.
Callista Hale is the beautiful proprietor of London’s most elite brothel. When a new gentlemen’s club positions itself to lure away her wealthy clientele, she’ll do whatever it takes to protect her business. Even if it means accepting a wicked offer from the club’s mysterious and sensual owner.

A man of experience.
From the moment he meets Madam Pendragon, Erik Maxwell vows to have her in his bed. Her sharp mind challenges him while her lush body sparks every fantasy he’s ever had. But he’ll have to use everything he knows about desire to get past the jaded lady’s formidable walls.

An offer too wicked to resist.
If the man believes he has the talent and skill to seduce her, Callista will gracefully accept his defeat—and his exit from London—when he fails. And he will, of course.
Unless, seduction isn’t all Erik Maxwell has in mind.