Oracles of Fire is a series of four books, mostly taking place after its sister series Dragons in Our Midst and before The Children of the Bard. It's main character is Mara (later called Sapphira Adi ), her sister Acacia , fellow Underborn Paili, and the main characters introduced in the previous books, namely Billy, Bonnie, Walter, and Ashley. The first book retraces the previous ones, along with events occurring thousands of years before, but from the point of view of Sapphira. Three new worlds are introduced: the Bridgelands, Abbadon's Home, and Second Eden. The Third Circle is also explored, and Heaven is actually seen for the first time.