In the isolated countryside of Maine, a group of young siblings live in secrecy, hiding their mother's death to avoid being separated. As they struggle to maintain their fragile refuge, a sinister presence lurking within the crumbling mansion threatens to tear them apart. The siblings must confront their dark past and confront the evil that has infiltrated their sanctuary. But as they delve deeper into the mystery, they uncover a shocking truth that could destroy their family forever. Will they be able to overcome their fears and unite against the malevolent force that haunts them? Or will it be too late?

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Some movies that have similar genres and were produced around the same time as Marrowbone include Goodnight Mommy, Smile, Nope, The Taking of Deborah Logan, Get Out, Host.