Alex believes the abbot's killer wanted to send a message; Martin finds clues; Céline studies the file of the investigation into Véronique's murder and makes disturbing discoveries about Damien.
The body of Father Sebastian, ruler of the Abbey, is found riddled with crossbow arrows; Céline and Alex inspect the crime scene which is located in the cave of Frère Jacques very close to the place where Véronique was killed.
Céline discovers that Véronique had a confessor at the abbey; Alex learns that in the 1950s, the monks sold the orchard to Marie-Thérèse Jolicoeur for a pittance.