Fortune Favors the Viscount by Caroline Linden

There’s no such thing as luck…
Once a lady, reduced to a governess, Emilia Greene is desperate. The child in her care has been left orphaned and penniless, and Emilia will do anything to protect her—even track down the girl’s only relation. That man would be the next Viscount Sydenham, and surely he’ll be gentleman enough to take care of his cousin.

Or scruples…
Unfortunately, that man is Nicholas Dashwood, the dangerously attractive owner of the notorious Vega Club. He’s no gentleman, and he doesn’t want a title. What Nick needs… is a governess, for his younger sister.

When your heart is at stake
Their precarious bargain throws them together in unsettling proximity, until neither can deny their attraction to each other. But Nick has enemies, and Emilia has secrets, and taking a gamble on happily-ever-after could cost them everything.