Books in espanol?

i have some neighbors who have been trying to discuss ‘dark spirituality’ the conversation began wiith- aren’t you afraid to be wearing that [my necklace in public]? So they are at the bottom of the spiritual growth ladder, but I was wanting to bring them up slowly as it were, but was hoping I could find them Luciferian and demonolatry type books in Spanish hoping it would help.

Does anyone know where I could get books on pdf etc,[ free if possible]
I would appreciate it.
Thanketh thee