There are 3 books in the French Letters series. The newest book is The Anonymous Letters of C Forestier which came out in 2024.

1
The Scandalous Letters of V and J

Book cover of The Scandalous Letters of V and J
Paris, 1823. Victor Beauchêne has led a stifling existence, unrecognized for both his cleverness and his gender, except in the pages of his meticulous diary. Abruptly cut off from his family’s fortune, he takes the opportunity to start a new life in a shabby boarding house with his beloved spinster…
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2
The Mischievous Letters of the Marquise de Q

Book cover of The Mischievous Letters of the Marquise de Q

Paris, 1825. Losing her husband is the best thing to happen to Delphine in ages. After he used magic to control her, Delphine's only regret is that she didn't kill that petty tyrant herself. Widowed, Delphine can pursue her dashing rescuer, the androgynous novelist Camille Dupin—and solve the mystery of…

3
The Anonymous Letters of C Forestier

Book cover of The Anonymous Letters of C Forestier

Paris, 1825. Isabelle de Tourzin cannot afford to fall in love with a mortal. Not again. Ageless and nearly invulnerable, she spends her days in private grief and plots to end Malbosc, the powerful, secretive man who seduced her only to leech her magic for more than a century.

She…