The demon master, Umaq, has captured Machu Picchu and transformed the Inca ruins into a mighty citadel. Aided by the witch Cessani, Umaq's goal is to open a portal to the netherworld and summon powerful demons in his quest to destroy the Inca sun god, Inti.
In Salem, Grace struggles to defy Cessani's dangerous coven and growing influence in the region. Witches from all walks of life join Grace or Cessani as both sides build momentum toward a frightening civil war. With the moon goddesses Mama Quilla and the Maiden on Cessani's side, the outcome looks grim for Grace and her followers.
Sybil and Marcelo must race to recruit allies and build their own forces to counter Umaq and Cessani in Peru. Battling adversaries and trying to master new abilities, Sybil's confidence unravels as self-doubt becomes her worse enemy.
Adding to Sybil and Marcelo's woes, an ancient vampire named Daiyu toys with the couple as they fight for their lives. With a multitude of adversaries and seemingly insurmountable odds, the death of a sun god and everlasting darkness will come to pass should Sybil and her friends fail to stop Umaq.