It's the night before Halloween, the night before Sabrina's sixteenth birthday, the night of the blood-moon and the lunar eclipse, and Sabrina has made her decision: She will go into the woods of Greendale as a half-witch and emerge...on the other side of a frightful ritual...as a fully baptized member of the Church of Night. But there will be a cost, and his name is Harvey. And unbeknownst to Sabrina and her aunts, there is a serpent in the garden, their great enemy Madam Satan, who is conspiring against them...