The Holloway family gathers for their third-generation reunion at the family's ancestral mansion. Silas, Emily, and their teenage son Aven are joined by Silas's sister Margaret, Emily's younger brother Daniel and his girlfriend Chloe, Chloe's twin brother Chris, young siblings Lily and Sam, and the playful twins Rachel and Ryan. As they arrive, the family is awed by the mansion's grandeur, yet a sense of unease lingers. Rachel and Ryan, always curious and adventurous, feel an inexplicable pull towards the mansion. On their first night, the mansion's eerie atmosphere becomes apparent. Lily hears faint, sorrowful singing in her room, Sam sees fleeting shadows in the hallways, and Rachel and Ryan find an old, dusty journal hidden in the attic.