Armand is the head of homicide for the Sûreté du Québec. Currently taking a leave of absence in Québec City, he is recovering from grave physical and emotional injuries sustained in a recent disastrous raid. He seeks quiet through historical research at the Literary and Historical Society but finds himself drawn into a local murder investigation. He relies heavily on empathy and intuition to understand the motives driving criminal behavior.

Jean-Guy is Gamache's cynical and impulsive second-in-command at the Sûreté du Québec. He is recuperating from physical injuries sustained during the same factory raid that wounded his mentor. At Gamache's request, he secretly travels to the village of Three Pines to reinvestigate a closed murder case, despite his deep distrust of the local residents. He relies heavily on painkillers to manage his lingering physical discomfort.

Augustin is an eccentric, fanatical amateur archaeologist famously obsessed with finding the lost burial site of Samuel de Champlain. His relentless and highly publicized digging around Québec City makes him a polarizing figure, generating both public interest and academic scorn. His sudden death in a library basement sparks a major police investigation.

Émile is the retired former head of homicide for the Sûreté du Québec and Gamache's trusted mentor. He hosts Gamache during his recuperation in Québec City, offering guidance and companionship. A proud Francophone with separatist sympathies, he holds deep knowledge of the city's history and its persistent political tensions.

Clara is a warm, empathetic, and perpetually disheveled artist living in Three Pines. She is on the cusp of gaining broader fame for her portraiture. When Beauvoir arrives in the village, she becomes his informal assistant, using her deep knowledge of her neighbors to help him review suspects in the Hermit case.

Ruth is an elderly, prizewinning poet living in Three Pines. Acerbic and struggling with an alcohol addiction, she alienates most of her neighbors. However, her sharp observational skills and pitiless demeanor make her an unexpectedly safe listener for Beauvoir's darkest memories.

Elizabeth is a senior board member of the Literary and Historical Society who comes from a wealthy, old-money Anglophone family. She serves as the quiet, unofficial leader of her shrinking community and fiercely protects their library, viewing it as a vital cultural repository.

Old Mundin is a talented carpenter and furniture restorer in his thirties living in Three Pines. He goes by a nickname given to him during his youth. He is devoted to his young family but carries lasting trauma from the loss of his father during his teenage years.

Tom is the young, optimistic Presbyterian minister of the church near the Literary and Historical Society. He is the youngest board member by decades and feels a heavy responsibility to preserve and protect his aging congregation and their heritage.

Olivier is the owner of the Three Pines bistro and antiques shop. He is currently incarcerated for the murder of the Hermit, a conviction based heavily on his proven greed and a lifelong habit of lying to protect himself.

Paul is a promising, idealistic young Sûreté agent who frequently plays the violin. His involvement in a severe, highly coordinated kidnapping plot haunts Gamache, who spends hours on the phone with him during the crisis.

Gabri is the voluble and theatrical partner of Olivier Brulé. He helps run the bistro and bed-and-breakfast in Three Pines. He remains steadfastly convinced of Olivier's innocence and campaigns tirelessly for the police to reopen the case.

Sylvain is Gamache's boss and longtime rival at the Sûreté du Québec. He is ambitious, arrogant, and highly skeptical of Gamache's investigative instincts, frequently attempting to override Gamache's orders during high-stakes operations.

Yvette is a surly, misanthropic Sûreté agent whom Gamache previously reassigned from homicide to communications. Despite her difficult personality and lingering bitterness, her technical skills prove essential when the team needs to trace communications during a crisis.

Reine-Marie is Armand Gamache's deeply supportive wife. A librarian by trade, she offers him stability and unconditional love, supporting his need to recuperate away from Montreal while monitoring his recovery from afar.

Myrna is a former psychologist who now runs the bookstore in Three Pines. Observant and grounded, she acts as a sounding board for her best friend Clara and tracks the shifting moods of the village during the ongoing investigation.

Peter is an artist living in Three Pines alongside his wife, Clara. He participates in the village's social life and discusses local mysteries with their neighbors.

Inspector Langlois is a senior officer with the Québec City police. He leads the local investigation into the body found in the library basement and relies heavily on Gamache's bilingualism and expertise to handle the politically sensitive case.

Serge is the irascible chief archeologist for the province of Québec. He views amateur historians like Renaud with disdain and resents police interruptions, though he possesses crucial knowledge about historical excavation sites in the city.

Ken is a board member of the Literary and Historical Society who competes in the city's extreme winter ice-canoeing race alongside Tom Hancock. He speaks in an unusually quiet, nearly inaudible murmur during ordinary conversation.

Vincent is a wealthy doctor who recently bought the resort property near the village. He has renovated the Hermit's former cabin into his home and offers unwanted medical advice to Beauvoir regarding his use of painkillers.

Carole is Vincent Gilbert's wife and the co-owner of a local spa. She originally comes from Québec City and acts hospitably toward visitors, though she remains a peripheral suspect in the Hermit's death.

Marc is the adult son of Vincent and Carole Gilbert. He harbors deep resentment toward his father for abandoning him emotionally while showering attention on other village residents.

Michelle is Old Mundin's wife and a devoted mother to their son. During a conversation about murder, she shares dark statistical facts that spark Clara's investigative curiosity.

Charlie is the young son of Old Mundin and Michelle. He has Down syndrome and receives speech therapy from Dr. Vincent Gilbert.

Mr. Blake is a knowledgeable board member of the Literary and Historical Society. He is a passionate champion of early Québécois social history and assists Gamache in decoding the library's obscure cataloging system.

Alain is a bookseller in Québec City who frequently sold rare volumes to Augustin Renaud. He provides Gamache with key information regarding Renaud's recent purchases from a controversial library sale.

Roar is a Czech-Canadian repairman who lives near Three Pines. He is one of the original suspects in the Hermit's death.

Havoc is the young son of Roar Parra. He learns basic carving skills from the village carpenter, Old Mundin.

The Hermit is an elderly, reclusive man whose murdered body was found in Olivier's bistro prior to the events of this case. The mystery of his true identity, his hidden cache of priceless antiques, and the cryptic carvings left in his cabin form the core of Beauvoir's reinvestigation.

Winnie is the librarian at the Literary and Historical Society. Her lack of fluency in French prompts Inspector Langlois to ask Gamache for translation assistance during the initial crime scene investigation.

Sean is a Francophone resident living in a wealthy area of the city. He unwittingly holds a crucial historical photograph of his Irish ancestor that helps Gamache track the movements of nineteenth-century laborers.