Consisting partly of documentary-style storytelling as well as dramatized narrative sequences, the film purports to chart the historical roots and superstitions surrounding witchcraft, beginning in the Middle Ages through the 20th century. Based partly on Christensen’s own study of the Malleus Maleficarum, a 15th-century German guide for inquisitors, Häxan proposes that such witch-hunts may have stemmed from misunderstandings of mental or neurological disorders, triggering mass hysteria.