At four and twenty, Miss Jane Colborne is firmly on the shelf, much to the chagrin of her brother, who sees her independence as highly unseemly. While taking a moonlight stroll at a house party, she stumbles upon a notorious rake spying on two Frenchmen. She offers her services to help the Home Office catch an English turncoat, turning her dull life as a spinster into one of adventure with plenty of intrigue. What she doesn't expect is to fall in...