Katz und Maus - Günter Grass

In a slim volume after his magnificent “The Tin Drum,” Grass continued experimenting with the device of an unreliable narrator.

It means that he plays “Cat and Mouse” with the reader, just as Mahlke, the youthful subject of the novella, will be the metaphorical mouse that is toyed with by the narrator —his so-called friend Pilenz— and by the malignant society of Nazi Danzig that he grows up in.