Gamache earns the displeasure of General Director Francoeur when he ignores his superior's orders and begins investigating the disappearance of Blue Two-Rivers.

Gamache conducts a re-enactment of the boxing day curling match to understand the riddle of the murder.

When resident Marc Fortier suddenly goes missing, Gamache returns to Three Pines and discovers the village's dark past with St Anthony's; Lacoste finds out the truth about an important piece of evidence in Blue's disappearance.

The villagers are forced to deal with the truth of their past as Gamache makes a breakthrough; Lacoste finds another clue about Blue's disappearance that could name a key suspect.

Two couples travel to the Manoir Bellefort in Montreal for their anniversaries, but their celebrations are interrupted when the Manoir's owners return.

Gamache is certain he is closing in on solving the mystery of Julia's murder; Kevin and Lacoste have a tense encounter as Lacoste tries to defend himself, saying he was framed for murder.