The extremely enchanting, totally perplexing, possibly never-ending quest for the Golden Owl

A labyrinthine treasure hunt has had thousands of players cracking codes and digging up the French countryside. Will the prize ever be found after a sudden death and bitter disputes? Phil Hoad explores stories surrounding the world's biggest unsolved treasure hunt—and the people who have been obsessed and perplexed by it for 30 years and counting. Read by Jonathan Booth.