From the Back of the book:

When a suitor tells Lady Arabella Blydon that he's willing to overlook her appalling bluestocking tendencies on account of her looks and fortune, she decides to take a break from the Marriage Mart. So during an extended stay in the country, she never expects to meet Lord John Blackwood, a wounded war hero who intrigues her like no other man.

Lord John has lived through the worse horrors of war, but nothing could be more terrifying to his tormented heart as Lady Arabella. She is intoxicating, infuriating and she makes him want to live again. Suddenly he's writing bad poetry and climbing trees in the pitch-dark night, just so he can dance with her. But when the harsh light of day replaces the magic of Midnight, can this tormented soul learn to love again?

This book is the reason that i love julia quinn books, she manages to revive the romantic in everyone