Polyansk will not sleep peacefully. The traditional hike of local residents and visiting summer residents to pick blueberries in the forest turns everyone into witnesses to a strange crime. Instead of blueberries, they find Olga Savrasova, an employee of the Luga Museum of Local Lore, in the forest. There is no evidence at the crime scene, only a mushroom knife, which most likely was used to kill the woman. It seems almost impossible to identify the killer. All hope lies only in the experienced investigator Taisiya Ignatievna. One of Sapphirova's most puzzling cases. Editor's comment: The final novel in the village series by Alexei Krotov, a resounding chord that concludes a long symphony of murders in Polyansk. The reader is in for an extremely complicated investigation, the outcome of which will leave you in alarming bewilderment for a long time.