The Dark Days Club and The Dark Days Pact by Alison Goodman
This YA fantasy trilogy is set in the Regency period in England (think Jane Austen). Lady Helen learns she is a Reclaimer, gifted with the strength and talent to fight Deceivers, people possessed by demonic spirits who feed off the life energy of others. Some of the fantasy elements struck me as just silly, especially when I tried to picture them visually, or say the made-up words aloud, but if you just go with it (an approach necessary for enjoying much fantasy) it pays off. The period language is fun, as is the juxtaposition of proper speech with scary, violent situations. Lady Helen is an admirable heroine, brave and selfless. She spends a significant portion of the second book in men’s clothes. Details like period dress, locations, and history are well-researched and informative. Lord Carlston, who inducts Lady Helen into the Dark Days Club and teaches her to be a Reclaimer, qualifies as a classically inscrutable and intense Byronic hero. Supporting characters, especially Darby, Lady Helen’s stout maid, are well-drawn and interesting. The plots are structured around mysteries that Lay Helen ably solves–at considerable personal cost.
I was particularly impressed by the ending of The Dark Days Pact. Goodman set her climax inside a real historical murder, explained the mystery of Lord Carlston’s illness and his strong connection with Lady Helen–and then revealed a complication that will keep them apart. Goodman is currently working on the third book in the trilogy, which doesn’t yet have a release date.