Sem Saída

The story takes place in Nova Esperança, fictional city of São Paulo (Brazil).
You are in control of a regular adult man called Marcos Leme, a simple helper in mail delivery, he is divorced and have a son to take care.
One night at 11PM (already passed his service hours), Marcos is still wandering the city with his arrogant working "partner", with only a mysterious letter addressed to a building that you've never heard about, arriving there, your partner leaves you all alone to make the delivery.
The plot takes place there, in that big building that you had no idea it existed, what is this place? It's really morbid, I don't feel good here, a great discomfort takes over my soul... I want to go home...