Jean-Guy is Armand’s son-in-law, characterized by his brusque demeanor and loyalty. He has a past marked by substance abuse but has grown into a responsible individual, showcasing bravery and perceptiveness.

Daniel, Armand's son, undergoes significant personal growth, initially displaying rudeness and secrecy. He grapples with familial resentment but works toward reconciling with his father.

Claude is an old friend of Armand’s and a fellow homicide investigator, intricately connected to the novel’s central conflict. He is adept at keeping secrets, serving as a key figure in the unfolding mystery.

Stephen is a wealthy businessman and father figure to Armand, known for his WWII Resistance background. Though he becomes a victim in the story, his investigatory work is crucial to uncovering the truth.

Reine-Marie, Armand’s wife, acts as the family’s voice of reason. She is instrumental in solving the mystery and maintaining familial bonds, particularly with her son Daniel.