A professor and artist who gains fame through a painting actually produced by Claire, representing a corrupted art world where reputation often outweighs true talent.

Claire’s best friend and an assistant curator at the Gardner Museum, who acts as a confidant during critical points in the story.

A group of Claire's friends who frequent Jake’s bar and provide support and gossip about the art world, including characters like Small, Danielle, Maureen, and Mike.

An art dealer and gallery owner known in Boston and beyond, whose plans to replace a stolen painting with a forgery have significant consequences.

A curator at MoMA who initially appears as a challenging presence to Claire but later provides support and understanding as the story develops.

An eccentric older woman, the only living relative of Isabella Gardner, who critiques the current management of the Gardner Museum.

Gallery assistants at Markel G who are trendy and enthusiastic, and grow to become allies to Claire.

A historical figure and founder of the Gardner Museum, depicted through letters and discussions among characters, illustrating her break from societal norms.

The fictional niece of Belle Gardner, mentioned in Belle's letters as a beloved family member.

A 19th-century French Impressionist painter with a strong connection to Belle Gardner, depicted in the novel through their interactions and correspondence.

An obscure Boston painter and art forger whose relationship with Amelia and backstory play a crucial role in uncovering the truth about a stolen painting.