[worktolive]

Free today and tomorrow from Sourcebooks:

Luck Is No Lady by Amy Sandas. According to the reviews the heroine is a math geek while the hero is a nice guy, not an alpha-hole.

Spoiler:

He's the dangerously charming owner of a gambling hell.
She's the brilliant daughter of a gentleman drowning in debt.
Forced to use her talent for mathematics to save her family, Emma finds herself drawn from London's glittering ballrooms deep into its gritty underworld...and discovers there the pleasure of falling from grace.

Emma Chadwick always assumed she'd live and die the daughter of a gentleman. But when her father's death reveals a world of staggering debt and dangerous moneylenders, she must risk her good name and put her talent for mathematics to use, taking a position as bookkeeper at London's most notorious gambling hell. Surrounded by vice and corruption on all sides, it is imperative the ton never discovers Emma's shameful secret or her reputation—and her life—will be ruined.

But Roderick Bentley, the hell's sinfully wealthy owner, awakens a hunger Emma cannot deny. Drawn deep into an underworld of high stakes gambling and reckless overindulgence, she soon discovers that to win the love of a ruthless scoundrel, she will have to play the game...and give in to the pleasure of falling from grace.

"You should not have kissed me," she replied breathlessly.
"I do a lot of things I shouldn't. It does not mean I won't do them again."