Strange and terrible things are happening in the glorious city of Cologne. And, apparently, they have been happening for a long time. But no one notices this, because no one is seriously interested in what children see, think and are afraid of. No one except one meticulous young investigator from the Cologne branch of the Congregation. But even Kurt Hesse, with his keen instincts, cannot imagine what he will have to face when he begins to study the legends of a century ago...