Humpty Dumpty had a great fall, and he's back in the form of a doll that belongs to a woman with dementia who starts to recall his dark past.

On a weekend camping trip, two struggling couples are haunted by La Patasola, a famed vampiric monster from Amazonian folklore, testing their relationships, morality, and will to survive.

Ignoring the eerie warning of a troubled mother suspected of child endangerment, a social worker and her own small kids are soon drawn into a frightening supernatural realm.