My Lady Pickpocket. Turn of the Century, #1

She lives by her wits; he plays by the rules. Together, they'll learn that sometimes taking risks brings the greatest rewards. Eliza Summersby has learned the hard way how to survive London's dangerous streets. With nimble fingers and a sharp mind, she's managed to stay one step ahead of the law-until the night she's cornered and makes a desperate leap into the nearest carriage to escape. She finds herself face-to-face with Sir Mark van Bergen, the youngest and most ambitious director at the Bank of England.
Mark should turn her in. Instead, he takes her home. What begins as temporary shelter soon becomes an arrangement they both treasure. But she's a pickpocket from Seven Dials with a dangerous secret, and he's a banker from Mayfair. Some divides seem too wide to cross-unless they risk everything for love.