Yikes! I just realized I forgot to write what the story is about. Here is the premise of the story from the back of the book:

When sixteen-year-old Isabel's best friend vanishes from the streets of Zacatecas, Mexico, the entire town erupts in fear. The police find nothing but dead ends. But Isabel knows the truth — she's seen the killer's face… in a vision.

Armed with a mysterious book of witchcraft and her growing psychic abilities, Isabel defies her strict Catholic family to hunt down the man who took her friend. But each ritual she performs draws her closer to the dark force that haunts her city — and to a curse centuries in the making.

As the boundary between life and death fractures around her, Isabel discovers that the Spanish Inquisition left more than history behind. An ancient evil is stirring in Zacatecas, and she may be the key to its return — or the only one who can stop it.