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Circles drawn with blue chalk appeared continuously on the streets of Paris late at night. Inside the circles were discarded sundries such as beer bottle caps, vegetable boxes, shoes, magazines, hats, etc. They were different every time, with the same sentence written on the sides. Is this a prank by a quirk, or is there another conspiracy? Sheriff Adamsberg thought the matter was strange and felt that something unusual would appear in the circle. He sent people to investigate and arranged for guards. Sure enough, corpses began to appear in the circle. At the same time, Adamsberg and his assistants also traced some clues, but the real murderer still had to go deep into the tiger's den and conduct rigorous reasoning to catch it.

Former Ministry of the Interior employee Kerrweiler found a bone that looked like a human toe on the fence of bench No. 102 In a small square in Paris. It was probably excreted by dog ​​feces. He tracked the dog walker all the way to a seaside town in Brittany. Sure enough, someone had fallen to death on a seaside rock there. The deceased was an old lady, Marie, who was the wet nurse of engineer Severan's wife Lina. Her husband Diego died about five years ago. Lina's first husband Thomas also died in an accident-whether these people were really accidental deaths or homicides, Kerwell and his assistants finally figured out the truth after follow-up investigations.

This book is the seventh novel of suspense thrillers in the "Adamsberg Sheriff Series" by contemporary French writer Fred Vargas. An abused pigeon, an industrial giant who was burned alive in a luxury car, and an old woman in Normandy was worried about the threat of the legendary "dark soldiers". Sheriff Adamsberg led the team to start investigating three cases at the same time. During the investigation, the clues of the case were intertwined in his mind, inspiring each other, and finally all came to light.