Robert is a 40-something Harvard professor of religious symbology visiting Paris for a lecture. He relies on his extensive academic knowledge of ancient history, art, and symbols to process the world around him. Uncomfortable with violence, weapons, and enclosed spaces, he operates as an intellectual problem-solver who is suddenly thrust into a high-stakes, dangerous pursuit.

Sophie is a highly trained cryptologist working for the French Judicial Police. She possesses a sharp, analytical mind and acts decisively when she suspects her superiors are making an error. Estranged from her grandfather for ten years after witnessing a secret ritual, she uses the decoding skills he taught her during childhood to untangle the cryptic messages he leaves behind at the crime scene.

Jacques is the renowned curator of the Louvre museum and the Grand Master of a clandestine organization known as the Priory of Sion. He is a devoted guardian of ancient secrets regarding royal bloodlines and the divine feminine. Following a fatal attack, he spends his final minutes setting up a complex, art-based puzzle to ensure his closely guarded information survives him.

Bezu is the tenacious captain of the French Judicial Police. Highly focused on his career and public image, he aggressively pursues suspects and prefers to run his investigations strictly by the book. He places immense pressure on his team and works relentlessly to secure convictions in high-profile cases.

Silas is a physically imposing monk with albinism who serves the conservative Catholic sect Opus Dei. Orphaned and imprisoned in his youth, he views the church as his savior and executes violent missions out of sheer devotion to his mentor. He actively practices corporal mortification, wearing a barbed cilice on his thigh to atone for his perceived sins.

Bishop Aringarosa is the president-general of Opus Dei. Fearing that the Vatican's progressive shifts will erode traditional Catholic orthodoxy, he actively seeks an ancient artifact to secure his sect's power and relevance. He previously rescued a violent fugitive from starvation, bringing him into the church as a completely loyal disciple.

Leigh is a wealthy British Royal Historian living at a private estate near Paris called Château Villette. A childhood bout with polio left him reliant on metal leg braces and crutches. He possesses an obsessive academic interest in the Holy Grail and eagerly offers his expansive knowledge to help Langdon and Sophie decipher ancient religious mysteries.

Rémy is the manservant employed at Leigh Teabing's French estate. He caters to the daily needs of his wealthy employer and assists with logistics when guests arrive unexpectedly in the middle of the night. Behind his professional exterior, he harbors a strong desire for financial independence and an early retirement.

Lieutenant Collet is the second-in-command at the French Judicial Police. He carries out technical surveillance and tactical operations under the strict oversight of his captain. Eager to prove his competence, he handles the logistics of the manhunt while trying to avoid professional errors that might anger his superior.

André is the manager of a highly secure Swiss depository bank in Paris. He prioritizes the privacy and security of his elite clients above cooperating with local law enforcement. When police arrive at his bank, he initially uses his resources to help his clients escape before prioritizing the bank's reputation.

Sister Sandrine is the maintenance administrator at the Church of Saint-Sulpice. She strongly disapproves of the rising influence of conservative church factions and their marginalization of women. Beyond her official church duties, she secretly acts as a sentry for a clandestine brotherhood, monitoring those who seek ancient artifacts.

Marie is a woman living quietly in the rectory adjacent to Rosslyn Chapel in Scotland. She spends her time studying the architectural symbols of the historical chapel and maintains a deep, quiet knowledge of ancient royal lineages and secret societies. Her presence helps bring context to the final stages of the Grail investigation.