Full spoilers follow.
Who Malcolm is. The film's foundational deception is that Malcolm is a hard-working doctor and an ordinary partner. He is neither. He is more than two hundred years old, and he has sustained his life by luring women to this cabin and delivering them as sacrifices to creatures living in the surrounding woods, who grant him continued existence in exchange. The anniversary trip is not a romantic gesture; it is a delivery. Every warm detail in the first act — the family cabin, the celebration, the isolation framed as intimacy — is retroactively revealed as logistics.
What the hauntings actually are. The undead presences Liz sees are not projections of a fraying mind, and they are not generic ghosts. They are the accumulated product of Malcolm's two centuries of offerings — the women he gave away, transformed. This is why the film's supernatural events track so precisely with Liz's suspicions about her partner: the haunting is the record of what he does.
The turn. Malcolm discloses his intentions and locks Liz in the basement to be taken. The sacrifice fails, and it fails for a reason embedded in the film's origin story: the pregnant woman from two hundred years earlier, at the root of the arrangement, looked exactly like Liz. The creatures do not tear Liz apart. They embrace her. The figure with the bag over its head removes the covering to reveal a face with multiple eyes and mouths, and identifies itself as Liz's child. Malcolm's selection criteria — he chose her because she resembled the original — are precisely what destroys him.
The ending. Malcolm wakes the next morning having aged decades overnight; the borrowed time is called in all at once. With the creatures behind her, Liz reverses the entire structure of the film: she captures him, ties him upside down, hangs him by his feet from a tree, and lowers his head into a pot of honey.
The hidden meaning that only lands afterward. The honey is not an improvised cruelty — it is the film's thesis made literal, invoking the mellified man, the body preserved and steeped in honey. Malcolm spent two centuries preserving himself by consuming women; he ends preserved by a woman, in the substance that defines preservation without life. And the title resolves into a double meaning. Malcolm was the keeper — the man who kept women, kept a house, kept himself. By the final shot Liz occupies that position, with a brood of her own and a property that still runs. The film's last, unresolved suggestion is whether she has broken the cycle or inherited it.