Gabriel is the former director-general of Israel's secret intelligence service who currently operates as an art restorer. He lives in Venice with his wife and young twins. He possesses a unique talent for both art restoration and painting forgery, skills he uses strictly to recover stolen artwork rather than for personal profit. He travels to Cornwall at the request of an old friend to investigate the suspicious death of a local art historian.

Chiara is Gabriel's second wife and the mother of their eight-year-old twins, Irene and Raphael. She works alongside her husband as his boss at the Tiepolo Restoration Company and previously served as a female escort officer for Israeli intelligence. She provides stability for Gabriel while managing their family life in Italy.

Timothy is a detective sergeant with the Devon and Cornwall police force. He is investigating the crimes of a serial killer known as the Chopper, but he strongly doubts this killer is responsible for the death of his neighbor, Charlotte Blake. Frustrated by his department's limited perspective on the case, he contacts his longtime friend Gabriel for unofficial assistance.

Christopher is a former Special Air Service operative and former assassin who now works as an officer for the Secret Intelligence Service (SIS). He drives a Bentley Continental GT and smokes Marlboros. He shares a long, complicated history with Gabriel dating back to 1989 and provides heavy tactical support for Gabriel's current operation.

Ingrid is a highly skilled Danish computer hacker and professional thief. She joins Gabriel in his investigation of the offshore art market, providing crucial technical support, safe-cracking abilities, and surveillance capabilities. She operates with a clinical compulsion to steal luxury items.

Robinson is a 64-year-old retired MI5 counterintelligence officer who now runs the highly secretive Harris Weber law firm. His firm specializes in creating limited liability shell companies to help ultra-wealthy clients manage their money, avoid taxation, and acquire high-value art anonymously.

Lucinda is a wealthy executive who runs Lambeth Wealth Management and serves on the board of trustees for the Courtauld Gallery. She is married to Hugh Graves and actively supports his political ambitions while managing vast sums of money for elite clients through offshore accounts.

Sarah is a former CIA operative who transitioned into the art world, currently managing Isherwood Fine Arts in London. She is married to Christopher Keller and maintains a close friendship with Gabriel, whom she occasionally assists with art-related inquiries and gallery connections.

Anna is a world-famous violinist who inherited a massive banking fortune built partially on art stolen during the Holocaust. She attempts to redeem her family's dark legacy by using her status in the art world to help Gabriel recover looted paintings.

Lambert is a French hacker who previously worked for France's foreign intelligence service before taking a job in corporate security. He currently conducts electronic intelligence collection for Trevor Robinson, but turns against his employer after realizing he is being targeted for assassination.

Monjean is a professional thief who specializes in stealing paintings to fund his lifestyle. He owns a twelve-meter motor yacht named the Mistral, which provides a mobile, untraceable base of operations for Gabriel's crew on the Mediterranean coast.

Lord Radcliff is the treasurer of the Conservative Party in British Parliament. He finds himself embroiled in a massive political scandal after accepting millions in financial contributions from a corrupt Russian billionaire, money designed to influence the leadership of the government.

Samantha is a journalist working for The Telegraph. She receives anonymous leaks regarding illicit political fundraising and writes high-profile stories about corruption within the British government, unwittingly becoming a pawn in a larger political scheme before aggressively seeking the truth.

Lovegrove is an art adviser who caters to the extremely wealthy, facilitating private sales and acquisitions. He provides Gabriel with critical information about the Geneva Freeport art market and acts as Anna Rolfe's consultant in exchange for heavily discounted restoration work on his own paintings.

Naomi works at the Louvre and dedicates her expertise to repatriating art stolen from Jewish families during the Holocaust. She originally asked Charlotte Blake to research a suspicious Picasso painting and later creates detailed, convincing fake provenances for Gabriel's forged paintings.

Hillary is the historically unpopular prime minister of England. She faces severe political backlash and forced resignation due to a financial scandal involving Russian political contributions to her party, a situation exacerbated by her desire to pass strict anti-money-laundering legislation.

Charlotte was an Oxford art history professor and author of a bestselling book about Picasso. Her recent, in-depth provenance research into an untitled surrealist painting looted during the Holocaust leads to her brutal murder, sparking Gabriel's investigation.

Holland serves as the director of the Courtauld Gallery in London. He possesses security footage relevant to Gabriel's investigation and agrees to share it in exchange for Gabriel cleaning a painting by Florigerio.

Ricard owns Galerie Ricard, an art gallery located entirely within the tax-free zone of the Geneva Freeport. He facilitates anonymous, offshore art transactions for shell companies, operating as a high-end money launderer for the global elite.

Don Orsati runs the Orsati Olive Oil Company, which operates as a legitimate front for his true business as a Corsican crime boss and contractor of assassins. He provides Gabriel with a secure location to hide a witness.

The Signadora is an elderly Corsican woman recognized by locals as a powerful psychic and healer. She performs traditional rituals using oil and water to detect and remove the "evil eye," possessing surprising and inexplicable insights into the lives of those who visit her.

Vera is a baker residing in the small English village of Gunwalloe. She is the first person to notice that her neighbor, Charlotte Blake, is missing and reports her concerns to local law enforcement, initiating the central investigation.

Amelia is a journalist for ARTnews who contacts Sarah Bancroft to request comments for a profile piece she is writing about Gabriel Allon's high-profile restoration work.

Christoph is the director-general of the NDB, Switzerland's internal security and foreign intelligence service. He uses his authority to assist Gabriel with law enforcement matters, manipulating local police to keep Gabriel's undercover operations hidden from the public record.

Menard commands the French art theft police squad. He monitors Gabriel's activities while in France and shares vital intelligence regarding unsolved murders connected to the art world, occasionally bending protocol to aid Gabriel's independent investigations.

Graham is the director-general of the Secret Intelligence Service (SIS) in the United Kingdom. He coordinates closely with MI5 and maintains a long-standing alliance with Gabriel, leveraging British intelligence assets to support his operations when political corruption threatens the state.

Amadou is an impoverished street vendor who works in Paris. He witnesses a fatal incident on the rue Chappe and sells this information, along with a piece of stolen property, to Gabriel.