Book 9 in the Detective Marcella Witch's series: The Guardians of Four, keepers of Earth's elements and the prime essentials of witchcraft, are disappearing under strange circumstances. Have they succumbed to a prophetical reality, or merely perpetrated the best internet hoax in recent memory? Either scenario could trigger a battle for control over the fifth element, the quintessential, and the possible survival of every witch on the planet. There's a fine line between practical magick and true mastery over the quintessential. Crossing that line requires the mettle of conviction, a declaration of attitude and the heart of a pentacle prodigy. Not one of the three will do. A good witch knows that. A bad witch doesn't care.