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Ongoing series by Ed Brubaker, Marcos Martin and Muntsa Vicente.
Friday Fitzhugh spent her childhood solving crimes and digging up occult secrets with her best friend Lancelot Jones, the smartest boy in the world. But that was the past, now she's in college, starting a new life on her own. Except when Friday comes home for the holidays, she's immediately pulled back into Lance's orbit and finds that something very strange and dangerous is happening in their little New England town...
This is literally the Christmas vacation from Hell and neither of them may survive to see the New Year.