Jean-Baptiste Adamsberg is not like other policemen. His methods appear unorthodox in the extreme: he doesn't search for clues; he ignores obvious suspects and arrests people with cast-iron alibis; he appears permanently distracted. In spite of all this his colleagues are forced to admit that he is a born cop.
When strange blue chalk circles start appearing overnight on the pavements of Paris, only Adamsberg takes them - and the increasingly bizarre objects found within them - seriously. And when the body of a woman with her throat savagely cut is found in one, only Adamsberg realises that other murders will soon follow…
