The Mysterious Miss Lydia — Maggie Dallen

This spy is playing cat and mouse with an unsuspecting wallflower... Bookish Miss Lydia has been mistaken for many things. A part of the draperies, for example, and once a potted fern. But she's never been mistaken for a spy. At least, not until a former agent of the crown mistakes her reticence for deceit, and draws her into a game of espionage. It takes several stolen kisses and a midnight rendezvous in the garden before he realizes he may have made a mistake. Perhaps Lydia is not the lady he's after...but maybe she's exactly the woman he needs.