Fiona Walker alerted me yesterday to the fact that amazon.co.uk are listing a new offering from Fred Vargas for February 2009 - The Chalk Circle Man.
The lovely publicists at Harvill have advised me that this is in fact the first in the Adamsberg series (and I believe first published in French in 1996 as L'Homme aux Cercles Bleus).
Currently translated in the Adamsberg series are nos 2,3, 5 and 6:
Seeking Whom He May Devour (2004) #2
Have Mercy on Us All (2003) #3
Wash This Blood Clean From My Hand (2007) #5
This Night's Foul Work (2008) #6