The San Cristóbal building

3:17 a.m. A doorbell. A dead man asking to be let in.

Juan Valdés wakes to pounding on the door next to his. His neighbor Sandra, terrified, swears the man shouting in the hallway is her boyfriend, buried three months ago. Over one night Juan will learn that a reflection does not always copy the person it belongs to, that the San Cristóbal building has more floors than its blueprints show, and that there is one rule no one may break: never answer the fourth ring.

The San Cristóbal Building is a psychological and supernatural horror novel about guilt, memories we would rather bury, and doors we should never open. A short, tense, fast read for fans of haunted buildings, mysteries with their own rules, and endings that stay with you.