A Fiona Figg & Kitty Lane Mystery Books in Order

This series takes the world of Fiona Figg and opens it up in a bigger, livelier way. Fiona is no longer learning the ropes alone. Now she is paired more fully with Kitty Lane, and the books lean into the pleasures of partnership, travel, and comic timing without losing the wartime danger that shaped the earlier Fiona stories.

Two sleuths are better than one.

By the time these books begin, Fiona has already proved she can survive undercover work, social traps, and murder investigations. Kitty changes the rhythm. She gives Fiona someone to argue with, protect, and depend on, and that makes the stories feel more open and more playful. The cases are still full of spies, suspicious deaths, and shifting loyalties, but now there is an extra spark in the banter and a stronger sense of teamwork.

The settings do a lot of the heavy lifting here. Fiona and Kitty are sent far beyond London, into ocean liners, New York concert halls, Egyptian tombs, snowbound Italian hotels, grand country houses, revolutionary Moscow, and the bustle of Piccadilly. Those places are not just scenery. They shape the mysteries, the suspects, and the kind of trouble the women run into. A murder in a desert dig feels different from a murder in a blizzard, and the series clearly enjoys giving its heroines new corners of the war era world to navigate.

There is still an espionage thread running under everything. British Intelligence missions, secret plots, missing agents, and political unrest keep the stakes real, even when the books are at their funniest. Fredrick Fredricks remains a delicious complication, sometimes nemesis, sometimes possible ally, and Archie Somersby continues to pull on Fiona's heart. That means the series offers both standalone mysteries and an ongoing personal story about love, trust, and choosing between head and heart.

The tone is cozy, but not sleepy. These books move. There are bodies in locked rooms, suspicious archaeologists, poisonings, suffragettes, jujitsu clubs, and hotel corridors full of secrets. Fiona still loves a disguise and a proper cup of tea, but Kitty helps push the pace and keeps the energy bright.

If you like historical mysteries that mix murder with spy work, travel, and a lot of character chemistry, this is a very enjoyable run of books. It keeps the wit and warmth of Fiona's earlier adventures while giving her a true sidekick and a wider stage.