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In this article, we aim to demonstrate the fragility of the diagnosis of psychosis concerning Maupassant. To this end, we analyze the mechanisms at work in the outbreak of psychosis (the One-Father), then the psychotic productions: hallucination and delirium. The appearance of an unexpected third party (Flaubert) does not give rise to any psychotic element. When the (double) hallucinations occur, they are not a sign of a disturbance of the symbolic order. As for the delirium, it is part of a neurological disorder of a syphilitic type and seems to be an attempt to reconstruct a world that is in pieces. Finally, the diagnosis of schizophrenia is made extremely difficult by the polypathology of the writer, who was also suffering from early dementia while at the same time being a great user of diverse legal (pharmacopedic) and illegal toxic substances (ether, cannabis, etc.).