Maisie Dobbs by Jacqueline Winspear. "This is a series of 15 cozy British mysteries written over the past 15-16 years. Born into a lower-class service family, Maisie is taken under the wing of an aristocrat family, educated, and sent off to serve as a nurse in World War I. Returning from war, she becomes a private investigator, and every book in the series shows how she evolves over time, how she finds and spurns love, how she connects to family, and how she solves murders, art theft, and other crimes. I’m on my second read-through of the whole series, and am falling in love with it all over again. Really recommend this as a year-long project if anyone wants/needs a new-to-them series to dig into."