Long ago, young Viscount Bradley's prudish family forbade him to marry his beloved. Now, the aging lord has plotted a subtle revenge. His three nephews can split his fortune, but only if each marries a fallen woman. Two have found brides who meet the terms and all depends on the youngest, Peregrine Sullivan.

Only desperation would drive a lady to disguise herself in hopes of employment, but the twenty thousand pounds that their father promised beautiful Alexandra Douglas and her invalid younger sister has vanished into the hands of the greedy cousin who inherited the estate. Alexandra, in search of justice, embarks on an elaborate charade to infiltrate Combe Abbey, her ancestral home, and secretly take the money back.

Peregrine, visiting the Abbey, is intrigued by a woman whose mind matches his on every level. Who is this middle-aged spinster with a young woman's eyes and a youthful step that even a limp cannot disguise? Sensing some scandalous secret, Perry assumes the lady would delight in being rescued. But his efforts are rebuffed; Alexandra will take care of herself and her sister, thank you very much. Can Perry court the daring and independent young woman, win her heart, and be the last brother to wed?