A man walks, swaying more than usual, through the streets of Barcelona's Raval neighborhood. He carries a can of Voll-Damm beer in his hand. It's dark, but not yet six in the evening. He glances both ways, trying to spot if anyone is following him. Finally, he stops in front of a doorway. It's number 3 Vistalegre Street, next to the Raval promenade. The door is made of opaque glass, and there's no light inside. He scans his surroundings again and decides to take the plunge. He knocks and waits. No one answers. He grumbles. He knocks again, this time more forcefully, and shouts in case someone hears him. Again, his calls go unanswered. Disappointed, he turns around and disappears back into the narrow streets of Ciutat Vella.