At evening, Carlos disappears... Lea, Pedro and Rafa start looking for him, they search all around Sintra. Was already night time when there was just one place they didn't go... the Castle "dos Mouros". Even how frightened they were the start the walk, through the castle. At that time parents were already worried. It wasn't the first time a kid disappeared, a legend of a monster existed in Sintra... Híssis.