Who would kill a Carthusian monk and why? As the investigators will find out, the key to the mystery lies in the ultra-secret formula of the Chartreuse plant liqueur.

The body of Brother Yves is found hanged by the feet from a cross in Montjoyer cemetery, near Fresange Abbey in the South of France. Who could have killed the Cistercian monk and for what motive? Investigators Alicia Tirard and Alex Lazzari discover that the key to the riddle is the secret formula of a plant-based liqueur the monks of Fresange have been producing since the Middle Ages.—Happy_Evil_Dude