After the sudden loss of her beloved abuela Isadora, young bruja Althalia Cabrera is desperate—if she can act quickly enough, she may be able to pull Isadora back from a cruel eternity she doesn't deserve. Going against both everything she was taught and the warnings of her family, Althalia opens a forbidden door to the ancient past and enlists the help of the Aztec death deities Mictēcacihuātl and Mictlantecuhtli. The connection supercharges Althalia's powers but threatens the balance she must maintain if she has any chance of saving Isadora without losing everything else she believes in.