The old Valmorin died 200 years ago. The notary tells the family about the inheritance: the one who is terminally ill will receive the money. They all try their luck with getting ill before the other so one family member pretends to be deaf, another pretends to have a terrible back ache and so on...

It centres on the life of the entomologist Jean-Henri Fabre and his total devotion to studying insect behavior, travelling from Avignon to Paris, from Paris to his death in Sérignan. He is honoured by the French president Raymond Poincaré and his patience, obstinacy and knowledge are also recognised by Napoleon III, the publisher Charles Delagrave and the philosopher John Stuart Mill. They reach their climax in his book, Souvenirs entomologiques.