On a fateful summer night in 2012, there were 3 KNOCKS on the door of the Sprague family home. 3 KNOCKS that would end in tragedy.

Fast forward to 2024. April and Steven are now estranged as a result of those 3 KNOCKS twelve years before. Steven reaches out to April for reconciliation and closure on that tragic night. They must go back to the family, known as the big house, to face the malevolent force that drove them apart. They must figure out the secret of those 3 KNOCKS or die in the attempt.