On a remote forest road, a woman is hit and dies. The nurse had a violent husband, who is immediately targeted by Commissaire Luc Verlain. But it soon becomes clear: The courageous woman was investigating some suspicious deaths among old people who spent their twilight years in the small beach towns along the Côte d'Argent, the Silver Coast. Luc's team has to pull out all the stops shortly before Christmas - the trail leads them to a monastery in the interior, where a very charming priest pulls his strings. A mysterious and touching case in the snowiest winter that Aquitaine has experienced in decades.