Keta has history with Isaac -- and she's sure it's tied to the case. Mariana gets to know her protector, a woman who claims she can keep her safe.

Using Nancy as the vessel and the claw that was stuck in his back, Elvis performs an ancient ritual to summon the demon — with unsettling results.

Mamá Chabela reveals her plans for the future, and Cardinal Morelo asks Ventura to choose sides. Elvis goes looking for the Diableras.

Elvis and his crew race to find Mamá Chabela and the children in time. Elsewhere, a spell has Isaac behaving unlike himself.