Ivo and Tomás, two volunteered vagabonds who feed their souls of ways and great winds. From time to time they make a stop, renting their arms, the necessary time to be able to, provisions made, get on the road again. Once, with the sun at its peak and a burning heat, the desert that they are crossing seems to be endless. They run out of water… in the end of the day, without any strength left, they let themselves fall near to a dried bush. Ivo stares at the moon rising, as is saying farewell and whispering verses of a poem of a lawyer they’ve met before. It is then that he sees a far light. They set their way to that house…

On the riverside quay of the enormous container port of Lisbon two old decaying sky-blue painted buildings are located directly opposite to each other. One is closed and abandoned, the other inhabited by the two bright and inquisitive girls Ana and Matilde. Watching the closed building every single day and night the sisters get more and more suspicious. Strange phenomenons and movements behind the thick blue walls increase their curiosity. How is possible what their children`s eyes are witnessing? Who are those mysterious neighbours? How to discover old house`s secret?