Samuel is an eleven-year-old boy born into enslavement who works on the Hackler plantation. Having been separated from his mother when he was an infant, he relies heavily on the older individuals who raised him. He is naturally curious and observant but has internalized a deep fear of running away due to the psychological manipulation of his enslavers. As he travels, he unlearns these fears and becomes more self-reliant.

Harrison is a seventy-year-old enslaved man who has survived decades of brutal treatment. Having lost numerous family members over his lifetime, he is highly secretive about his past to protect himself from further grief. Despite his advanced age and declining health, he organizes a daring escape plan to seek a life beyond the plantation, taking Samuel with him into the unknown.

Mr. Hackler is the cruel owner of the Kentucky plantation where Samuel, Harrison, and Lilly are enslaved. He views the people he enslaves strictly as financial assets, frequently assigning them monetary values to break their spirits. He uses manipulation, starvation, and physical violence to maintain absolute control over his property.

Miz Catherine is Mr. Hackler's wife and an active participant in the horrors of the plantation. She matches her husband's cruelty with her own petty violence, frequently lashing out at the enslaved people over minor accidents. She encourages her children to view the enslaved workers as subhuman objects.

Lilly is an older enslaved woman who took on the responsibility of raising Samuel after his mother was sold away. She is deeply loving and practical, often using her meager savings to protect Samuel from the Hacklers' wrath. Her attachment to the plantation is tied to the graves of her children, preventing her from fleeing with Harrison and Samuel.

Cassius is the older son of the Hackler family. He focuses his energy on personal vices like drinking and gambling, leaving the management of the plantation to his father. He benefits directly from the brutal system his family operates while avoiding real responsibility for its daily functions.

Seth is the younger son of the Hacklers. Raised in an environment that normalizes absolute power over others, he actively torments the enslaved individuals on the plantation. He intentionally instigates situations to have them punished, enjoying the pain he causes without fear of reprimand.

Hannah is Samuel's mother, who was forcibly sold to another enslaver when Samuel was an infant. Though physically absent from his daily life on the plantation, her memory profoundly influences both Samuel's sense of identity and Harrison's determination to seek freedom.

The River Man is a rugged, scarred individual who operates a boat ferrying freedom seekers across the Ohio River. He is heavily armed and intensely practical, willing to make harsh decisions to ensure the survival of his group against pursuing patrols. He provides crucial survival advice to those he transports.

Hetty Scott is a woman seeking freedom who attempts to cross the Ohio River in the same boat as Samuel and Harrison. She attempts to travel while wearing multiple layers of fancy dresses, a choice that severely complicates her escape when she encounters the muddy reality of the northern shore.

Mrs. Taylor is a young white widow who allows freedom seekers to hide on her property. She is highly conflicted about this work and harbors strong racial prejudices, refusing to directly touch money handled by Black individuals. She participates in the network solely to honor the wishes of her recently deceased husband, Jacob, with whom she attempts to communicate.

Reverend Pry oversees a church that serves as a waypoint for freedom seekers. While he actively assists those fleeing enslavement, his methods are dangerous. He insists on documenting travelers' stories to share with his congregation, failing to recognize the severe risk this poses to people still actively on the run from authorities.

Mr. Keepheart works alongside Reverend Pry at the church. He exhibits a morbid and insensitive curiosity about the physical toll of enslavement. He asks invasive questions and demands to see physical scars without understanding the emotional harm his curiosity causes to the travelers.

Miz Kettle is a secretive participant in the network aiding freedom seekers. She operates with a strict focus on practicality, providing essential disguises and instructions while maintaining a cautious distance to avoid detection by authorities or local informants.

Ham is Miz Kettle's husband and a guide for freedom seekers. He uses clever tactics to protect those he escorts. By carrying a string of freshly caught fish, he provides travelers with a plausible cover story when walking open roads in broad daylight.

Green Murdock is a white peddler who views his involvement with freedom seekers primarily as a side business. He is talkative and boastful, using parlor tricks like fortune-telling cards to entertain himself. His commitment to helping others quickly evaporates when his guests become ill or lack sufficient funds.

Belle Henry is a formerly enslaved Black woman living in a free neighborhood in Ohio. She is warm and deeply compassionate. When other avenues of help fall through, she steps in to provide critical medical care using traditional remedies to treat severe illness.

August Henry is Belle's husband and a worker on the cargo trains. He leverages his employment on the railway to secure safe transport for freedom seekers. He demonstrates significant courage and ingenuity in the face of encroaching patrols, remaining calm under intense pressure.

Ordee Lee is a formerly enslaved man who fled a Kentucky plantation after a violent confrontation with his enslaver. Forced to leave his wife and children behind to avoid being sold away from them, he carries small physical tokens of his family as he endures the perilous journey north.