The lonely and bored grandmother Gisela Götz suspects one evening by chance to have observed a relationship crisis with alleged violent crime in the neighboring house of the young couple Amelie and Bernd Haynes. Gisela then begins to investigate from her armchair in order to prove her suspicions. One by one, the old woman also involves her granddaughter Mia, who usually takes care of her, in the detective game, but this eventually becomes a test of the grandma-granddaughter relationship. However, this is also largely due to Mia, who herself does not show her true cards and seems to conceal more information about the neighbors from her grandmother than Gisela believes.