The Traitor in the Tunnel by Y.S. Lee. Mysteries hold a special place in my fourth grade Nancy Drew-loving heart. Which is about the age you start to realize how much life isn’t particularly fair. At least with mysteries, you can count on a little justice at the end. Book 3 of The Agency series has upped the stakes for secret agent Mary Quinn, who has been planted in Buckingham Palace to solve a small problem for Queen Victoria. Start at the beginning with The Spy in the House, when Lee starts weaving pure fiction. As she says in the flyleaf, “If a top secret women’s detective agency existed in Victorian England, it left no evidence—just as well, since that would cast serious doubt on its competence.” I would not hold it against Lee if she didn’t keep her word at limiting this series to a trilogy, for the glow has not worn off Mary Quinn. Recommended for readers who enjoy strong female characters or Nancy Springer’s /Enola Holmes/ series.