When most people hear the word witches, they think of horror films and Halloween, but to the nearly one million Americans who practice Paganism today, it's a nature-worshipping, polytheistic, and very real religion. So Alex Mar discovers when she sets out to film a documentary and finds herself drawn deep into the world of present-day witchcraft. Witches of America follows Mar on her immersive five-year trip into the occult, charting modern Paganism from its roots in 1950s England to its current American mecca in the San Francisco Bay Area. Along the way she takes part in dozens of rituals and becomes involved with a wild array of characters: a government employee who founds a California priesthood dedicated to a Celtic goddess of war; American disciples of Aleister Crowley, whose elaborate ceremonies turn the Catholic mass on its head; second-wave feminist Wiccans who practice a radical separatist witchcraft; and a growing "mystery cult" whose initiates trace their rites back to a blind shaman in rural Oregon.