Every Heart A Doorway by Seanan McGuire
In a narrative that blends fantasy with a touch of the macabre, the story unfolds in a boarding school for children who have returned from magical worlds where they felt they truly belonged. These wayward souls struggle to adapt to their mundane lives, yearning to find their way back to the fantastical realms from which they were expelled. The protagonist, a girl who once wandered a land of the dead, must navigate the complex dynamics of her fellow students while the school becomes the setting of a mysterious and sinister series of events. As she delves into the investigation, the school's purpose and the students' stories intertwine, revealing the painful reality that not all doors to magical worlds can or should be reopened.