Some things should never be bred...

Barry Ocason, extreme sportsman and outdoor travel writer, receives a magazine in his mailbox and opens to an ad for an adventure in the Bavarian Alps. Initially dismissing the invitation, which seems to have been meant specifically for him, he soon finds himself involved in a larger plot and seeking answers to why an individual known only as the elephant man is terrorizing his family.

Barry and his daughter Kristen, who survived a twin sister taken from the family at a young age, travel from Juneau, Alaska to the sinister Spider Festival in Rio Tago, Brazil, before he ultimately answers the call to Bavaria, where the puzzle begins to come together.

Amid tribulation, death, madness, and institutionalization, a document emerges describing a scientist's bloody bid to breed a theoretical "third twin," which is believed to have the potential, through its connection with its siblings, to bridge the gulf between life and afterlife. The godlike creature that soon emerges turns out to be Barry's own offspring, and she has dark plans for the world of her conception that neither her father nor any other mortal can stop.