"In 1981, a young father and son set out on a road trip across Argentina, devastated by the mysterious death of the wife and mother they both loved. United in grief, the pair travels to her family home near Iguazú Falls, where they must confront the horrific legacy she has bequeathed. For the woman they are grieving came from a family like no other--a centuries-old secret society called the Order that pursues eternal life through ghastly rituals....