Jacob is a young English man who grows up in a fatherless home in Scarborough. His life is observed through the fragmented perceptions of those around him, making him an elusive figure even to his closest friends. He develops a deep fascination with ancient cultures and literature, eventually attending Cambridge University. After moving to London, he spends his time reading independently in the British Museum, attempting to write essays, and searching for a sense of purpose while keeping himself emotionally distant from the women who admire him.

Betty is Jacob's widowed mother, raising three young sons in the northern seaside town of Scarborough on a precarious income. She receives multiple marriage proposals from local men, choosing to reject all of them to focus entirely on her children. She carefully manages her sons' upbringings and educations, relying on the help of friends and neighbors to ensure they secure respectable places in society.

Richard Bonamy is an intelligent, discerning young man who shares Jacob's deep interest in literature and intellectual debate. He moves through early 20th-century British society while concealing his true emotional interior behind a composed facade. He observes Jacob's romantic misadventures with women with a quiet, lingering bitterness, harboring profound affections for his friend that he cannot openly express.

Clara is an intelligent, well-read young woman from a privileged background who harbors a long-standing, unrequited affection for Jacob. She shares his affinity for quiet reflection and classical thought, fitting the conventional mold of an Edwardian partner. Seeking independence from traditional constraints, she moves to London and takes a job in a tearoom, moving quietly on the periphery of Jacob's social world.

Sandra is an older, married Englishwoman traveling abroad with her husband, Evan. She exudes an air of tragedy and elegance, possessing a deep, somewhat performative appreciation for ancient Greek culture. Her confident navigation of high society and shared cultural interests make her a mesmerizing figure to Jacob, who views her as a symbol of unattainable refinement.

Florinda is a young Londoner with a wild temperament and little formal education. Having been abandoned by her mother, she drifts through the city and enters into a complicated physical relationship with Jacob. She attempts to bridge the gap between them by reading his philosophy books, though her lack of academic background creates a persistent barrier in their relationship.

Timothy is a Cambridge student from a wealthy family who becomes one of Jacob's close university friends. He shares Jacob's lofty reverence for ancient Greek civilization, frequently engaging in boastful intellectual debates. His comfortable background and family estate on the Scilly Isles highlight the stark class differences between him and Jacob.

Fanny is a part-time artist's model who develops a keen romantic interest in Jacob. Highly aware of her lack of formal education, she buys a copy of a classic novel simply because she knows Jacob respects it, planning to lie about enjoying the book. She observes Jacob from a distance, representing the city's artistic circles that intersect briefly with Jacob's life.

Captain Barfoot is a well-dressed town council member and consistent visitor to the Flanders household. Though he has an ailing wife at home, he makes a point to visit Betty every week, offering practical support and bringing the news of Jacob's admission to Cambridge.

Archer is Jacob's older brother. Growing up in Scarborough, he eventually joins the merchant navy, fulfilling his mother's hopes by following a path she imagines his late father might have approved of.

John is the youngest of the three Flanders brothers. He spends his early years under his mother's watchful eye, sharing Jacob's childhood interest in collecting bugs and preserving butterflies in their Scarborough home.

Evan is an unsatisfied politician traveling through Olympia and Athens. He extends polite invitations to Jacob to join their excursions, occasionally feeling flashes of jealousy regarding Jacob's interactions with Sandra.

Mr. Floyd is a local clergyman in Scarborough who teaches Latin to the Flanders boys to prepare them for their schooling. He harbors a deep affection for Betty, proposing marriage to her and keeping her polite rejection letter as a treasured keepsake.

Mrs. Durrant is the Scottish matriarch of the Durrant family. She hosts Jacob at her home on the Scilly Isles, observing him with detached curiosity while managing her estate and conversing with locals about agricultural issues.

Nick is a London painter who hires Fanny Elmer to model for his charcoal drawings. He is frequently frustrated by his inability to capture her likeness from various angles, viewing her through a purely artistic lens.

Seabrook is Betty's late husband and the father of Archer, Jacob, and John. Though his tombstone identifies him as a merchant, his actual career was far less stable, leaving his family in a precarious financial position after his death.

Rebecca is the nanny employed by the Flanders family to assist Betty in raising her three young sons. She handles the practical aspects of child-rearing, such as soothing the baby while Betty manages the household.

Mrs. Barfoot is Captain Barfoot's ailing wife. Bound to her home by sickness, she feels trapped in her own house, relying on hired help while her husband pursues his civic duties and social visits.

Mrs. Norman is a passenger on a train to Cambridge who cautiously observes the nineteen-year-old Jacob. Her shifting impressions of him emphasize how strangers perceive Jacob differently.

Simeon is a university student who stays up late with Jacob, smoking pipes and discussing Roman history. Their stilted conversation highlights the awkward intellectualism of their Cambridge environment.

Mrs. Jarvis is Betty's elderly friend in Scarborough. They spend evenings sitting on a bench overlooking the Roman ruins, sharing town gossip and discussing the letters Betty receives from Jacob.