Love is the only risk they can’t calculate.

Fern may be the youngest daughter of a powerful aristocrat, but she’s always felt invisible—overshadowed by her beautiful twin sister, Rose. With a mind built for mathematics and a heart set on studying at Oxford, Fern knows her dream is impossible in a society that values women’s beauty over their brains. Until a chance encounter with a charming Oxford student at a masquerade ball gives her the courage to seize an extraordinary opportunity: to trade places with her sister, just for one night.

Alex Carroway, a penniless student and the son of a tradesman, has no business falling for a society beauty. Marrying well is his one ticket to a better life, and the glittering Rose is the perfect match to secure his future. But it’s her clever, captivating sister Fern who truly steals his heart—and his carefully laid plans begin to crumble.

Now Fern must decide: will she risk everything she’s ever wanted for the one thing she never thought she deserved—love?

Alex thought he had his life all figured out, but loving Fern might just be the one problem he can’t solve.

Perfect for fans of smart heroines, sizzling chemistry, and slow-burn romance, Adding Up to Love is a witty and steamy historical romance with no cheating, plenty of angst, and a guaranteed happily ever after. This standalone novel is the first in the captivating Flower Sisters Series.