Because Mama has a late shift and Papa is far away, Merle and Moritz have a new night nurse. Her name is Gesine Wolkenstein, she has thin lips and eerie eyes that are first grass green, then black, and finally light blue and transparent. Of all people, she is supposed to put the children to bed? But at night, Gesine Wolkenstein becomes Mrs. Wolle. She leads the children into the realm behind the wallpaper door. There, where the sharp-toothed trolls live and the orphan fox Silvertear never leaves their side. There, Mrs. Wolle can stop time, apply the thought brake, and even make Papa feel close again. And that is incredibly comforting.