On the eve of Sabrina's sixteenth birthday, she faces a choice that will determine her destiny as a half-witch/half-mortal, an unspeakable terror arrives in Greendale, and her name is... MADAM SATAN! At long last, the secret history of the Queen of Hell is revealed, and she sets her vengeful gaze upon the SPELLMAN family. No one, especially those close to Sabrina, is safe, and very, very soon, the quiet streets of Greendale will run red with blood.