Never Mix Sin with Pleasure by Renee Ann Miller

With the proper calculations, even a reckless rake and a secretly infamous woman can find a love they can count on . . .
No one would ever guess that Olivia Michaels, companion to an elderly dowager, is really the thief the London newspapers have nicknamed the Phantom. Working in a nobleman’s home is the perfect guise to gather information, allowing her to exact her own justice on several wicked noblemen. But when the dowager’s grandson, notorious ne’er-do-well Lord Anthony Trent, requires her assistance with some tasks of his own, Olivia discovers that the charming rogue may be capable of stealing something himself—her heart . . .
Anthony has his own secret: Numbers get jumbled in his head. He’s cultivated his reckless reputation as a way to avoid dealing with his family’s businesses. Yet as obligations fall on him, he’s determined to prove his worth, and Olivia’s genius for numbers is a boon he hadn’t expected. But as the pair pore over ledgers together each evening, their connection blooms into a heated flirtation that threatens to expose the secrets each of them has been hiding . . .
Can desire and deception ever add up to true love?