Mie's uncle, Erik, suddenly disappears one day. As Mie tries to find out what has happened, she finds Eriks´ old diary. According to the diary, his bricklayer job lead to a really scary side job. Has Eriks´ disappearance got something to do with the side job? And how will this affect on Mie's life too? If you dare to read this story, you will find out what is hidden behind the walls in the buildings in Copenhagen.