The Flight of Icarus by Raymond Queneau
In late-nineteenth-century Paris, the writer Hubert is shocked to discover that Icarus, the protagonist of the new novel hes working on, has vanished. Looking for him among the manuscripts of his rivals does not solve the mystery, so a detective is hired to find the runaway character, who is now in Montparnasse, where he learns to drink absinthe and is picked up by a friendly prostitute.