Un misterio en Aber Wrac'h

As the Breton summer continues happily into October, the sun is shining and the nights are balmy, Labat suffers a blow of fate. His 89-year-old aunt died at her home after suffering a series of "death omens." The inspector, who was very close to the woman, head of the family clan, visits the old Los Angeles Abbey where the old woman lived, and there she is the victim of a brutal attack. Shocked by what happened, Inspector Dupin and his team move to the Aber Wrac'h and take charge of the investigation together with Commander Carman of the local gendarmerie. The old woman lived on a large property with an apple plantation and an orchard of aromatic and medicinal plants in which they find mandrake, which is discovered as the cause of the woman's death. Do the pages torn out of her birding notebook have anything to do with the death of Labat's aunt? What secrets are the other family members hiding?