Paris. 1917. Never underestimate the power of a good hat... or a sharp hatpin.

Sent by the War Office to follow the notorious Black Panther, file clerk turned secret agent Fiona Figg is under strict orders not to get too close and not to wear any of her usual "get-ups."

But what self-respecting British spy can resist a good disguise?

Within hours of her arrival in Paris, Fiona is up to her fake eyebrows in missing maids, jewel thieves, double agents, and high treason.

When Fiona is found dressed as a bellboy holding a bloody paperknife over the body of a dead countess, it's not just her career that's on the block.

Her next date might be with Madame Guillotine.