Professor Unrat, oder, Das Ende eines Tyrannen

Raat, a tyrannical schoolmaster in a north German town whom his pupils call Unrat, tries to catch his students at a disreputable harbour cabaret. Instead he falls for the singer Rosa Fröhlich, and his fall turns into a strange revenge on the town that mocked him. The novel behind the film The Blue Angel. This book uses the racial and other slurs of its period as written; the Book Guide explains these words where they occur.

Summary written with Claude Opus 5.5.