Within follows a widower, his daughter, and his new wife as they move into a new house in a seemingly perfect suburban neighborhood. The house has an unsettling history, and as the family begins to settle in, they start to experience strange occurrences. Things move on their own, and it becomes clear that their new home may not be as empty as they thought. The family must uncover the horrifying secret of their new dwelling before they become the next chapter in its dark history.