1818: Destitute, disillusioned and desperate, Lady Rosalind Marlowe sets the tongues of Regency London wagging when she becomes the Mayfair Thief. Targeting only those she knows won large sums of money from her father, bleeding him dry and causing him to take his own life, she decides to teach them a lesson. She takes something valuable from each, leaving her calling card with a bible quote behind her. On her last outing, she is caught red-handed.

Bored, restless and guilt-ridden over the death of his own father and with his accusations of him being a selfish whelp still ringing in his ears, Lord Atherton heads off a bow street runner who is pursuing Rosalind and in an altruistic act he engages her to be a companion to his mother. Unaware that he has become the target of enmity from a desperate gambler from whom he has won a large sum of money, they are thrown into a series of increasingly dangerous situations. Can love blossom amidst the perils and pitfalls of Regency England?