It Will Just Be Us by Jo Kaplan

A terrifying new gothic horror novel about two sisters and a haunted house that never sleeps, perfect for fans of Shirley Jackson's We Have Always Lived in the Castle.
They say there's a door in Wakefield that never opens...
Sam Wakefield's ancestral home, a decaying mansion built on the edge of a swamp, isn't a place for children. Its labyrinthine halls, built by her mad ancestors, are filled with echoes of the past: ghosts and memories knotted together as one. In the presence of phantoms, it's all Sam can do to disentangle past from present in her daily life.
But when her pregnant sister Elizabeth moves in after a fight with her husband, something in the house shifts. Already navigating her tumultuous relationship with Elizabeth, Sam is even more unsettled by the appearance of a new ghost: a faceless boy who commits disturbing acts-threatening animals, terrorizing other children, and following Sam into the depths of the house wielding a knife....

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