The title refers to a specific sticker or "pegatina" found in the book, though its significance is a point of debate among reviewers. Reader Reception

The story begins with Mariana visiting her best friend, Julia, to celebrate her move to a luxury skyscraper in a modern district. Their evening is interrupted by a doorbell ring; upon opening the door, they find the body of a man, , who has been stabbed in the back with a kitchen knife.

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