La bruja escondida (The Hidden Witch - Spanish edition)
Author: Molly Knox Ostertag
Aster and his family are adjusting to his unconventional talent for witchery; unlike the other boys in his family, he isn't a shapeshifter. He's taking classes with his grandmother and helping to keep an eye on his great-uncle whose corrupted magic wreaked havoc on the family.
Meanwhile, Aster's friend from the non-magical part of town, Charlie, is having problems of her own—a curse has tried to attach itself to her. She runs to Aster and escapes it, but now the friends must find the source of the curse before more people—normal and magical alike—get hurt.