When a teenage girl does not return home from a festival, her parents contact the police.

One evening in Autumn, Mallard and his wife are assaulted at the corner of a street. There ensued an infernal race where he will be successively the witness, the author and the victim of what would prove to be the key of its existence.

One evening in Autumn, Mallard and his wife are assaulted at the corner of a street. There ensued an infernal race where he will be successively the witness, the author and the victim of what would prove to be the key of its existence.