The Bad Ones by Melissa Albert

In the course of a single winter’s night, four people vanish without a trace across a small town.

Nora’s estranged best friend, Becca, is one of the lost. As Nora tries to untangle the truth of Becca’s disappearance, she discovers a darkness in her town’s past, as well as a string of coded messages Becca left for her to unravel. These clues lead Nora to a piece of local lore: a legendary goddess of forgotten origins who played a role in Nora and Becca’s own childhood games. . . .

An arresting, crossover horror fantasy threaded with dark magic, THE BAD ONES is a poison-pen love letter to semi-toxic best friendship, the occult power of childhood play and artistic creation, and the razor-thin line between make-believe and belief.