一早在图卢兹各地发现了尸体，案件交由资深队长Simon Keller侦办。协助办案的是刚从警校毕业的Gimet，这是她第一次实地调查。他们发现谋杀案与克劳德努加罗（Claude Nougaro）一首歌的歌词有关。疾病缠身的Keller希望能尽快结案，Gimet会发现这个案件使得童年的痛苦秘密重新浮现。

Bodies were discovered early in the morning in various parts of Toulouse, and the case was handed over to senior captain Simon Keller for investigation. Is C, who just graduated from the police academy, assisting in the case? Cile Gimet, this is her first on-site investigation. They found that the murder case was related to the lyrics of a song by Claude Nougaro. Illness ridden Keller hopes to close the case as soon as possible, C? Cile will find that this case brings back the painful secrets of childhood.

Le commandant de police Simon Keller, affaibli par la maladie, fait équipe avec une jeune recrue sortant de l'école, Cécile Gimet, pour enquêter sur le meurtre d'un homme retrouvé dans la basilique Saint-Sernin de Toulouse, autour de la chanson "Toulouse" de Claude Nougaro.