I recently got back from la Creuse in central France, where the annual local treasure hunt has been glossed by an insanely elaborate, cross-disciplinary polytext. The instructions for ‘Sherlock Holmes enquête à Boussac’ come on a double-sided sheet of A3 done up to look like an old newspaper, l’Eclaireur. About 15 square inches of it are taken up by the rules; the rest – six fat columns of newsprint (c.3300 words) – is devoted to explaining the game’s back story. Holmes and Watson have been summoned to the small Creusois town of Boussac by a painter friend, who has been tipped off by one of his more famous painter friends (Gauguin) that there’s buried treasure in the region.