When a mission of critical importance arises, Lord Lynsley, the enigmatic head of Mrs. Merlin’s Academy for Extraordinary Young Ladies, is forced to take on the assignment himself. But when things take an unexpected turn, he has has no choice but to ask for help from a former agent whose injury during a botched mission ten years ago forced her to retire from the elite unit of unconventional lady spies.

Can old wounds—both physical and emotional—be put aside in order for them to work together to destroy a new weapon that may give Napoleon and the French an insurmountable edge in the war against Britain and its allies? The mission takes them into the heart of enemy territory, where danger threatens from all angles, and to have any hope of survival they will have put aside old hurts and trust each other...