book about woman trying to find out if witches are real with eccentric man lying about being part of an organization. Read around 2022

[Deborah]

Read around 2022. Protagonist was a woman who translated ancient texts at a college. She got recruited by a kind of eccentric guy that was trying to figure out if witches were real, claiming to be part of an organization. Author was male and also wrote sci fi books. large book with tan cover that maybe looked like a manilla folder. title was not about witches, was something like "The Something Something Files."

[Kris]

Deborah, what's the genre (which we need to add to the topic header) - e.g., adult fantasy, mystery, thriller, etc.? Any romance?

Story's location/ country?