Virgil is an educated homicide detective from Pasadena, California, passing through Wells to visit his mother. Because he is Black, he immediately faces prejudice and hostility from the local police, who initially suspect him of murder. Despite the discrimination, he approaches the investigation with poise and rigorous professionalism, applying advanced investigative techniques to find the truth.

Sam is a white police officer and former mechanic who takes pride in his nightly patrol duties. He lacks formal police training and holds the ingrained racist prejudices typical of his environment. As he works alongside Virgil, his initial hostility gradually gives way to an uncomfortable respect for the visiting detective's capabilities.

Bill is the newly appointed chief of police in Wells, originally from Texas. He is physically imposing and bullheaded. He is determined to assert his authority despite lacking the qualifications and diplomacy his position requires. He actively resents Virgil's presence and expertise but recognizes the political necessity of keeping him around.

Enrico is a sociable and trusting Italian conductor who visits Wells to oversee the final preparations for an upcoming music festival. His murder serves as the inciting incident that forces the town's police to work with an outside detective.

Duena is Enrico's daughter, staying with the Endicotts in Wells. She grieves her father deeply and faces prejudice due to her Italian heritage, which gives her a sense of sympathy toward Virgil's situation.

Mr. Endicott is a wealthy, influential Northerner and city council member living in Wells. Unlike the local residents, he is progressive and treats Virgil with immediate respect. He uses his power to force the police department to utilize the detective's skills.

Harvey is a poor white man with a troubled past who becomes the first local suspect in the murder investigation. He is left-handed and defensive, reacting to police questioning with aggression and racial hostility.

Delores is a sixteen-year-old girl living in a poor neighborhood of Wells. She is unkempt but attracts the attention of local men by exposing herself in her window. She later becomes a central figure in an accusation that shifts the local police department's priorities.

Ralph is a young counterman at the local all-night diner. He is deeply prejudiced and openly refuses to serve Black customers, directly challenging the officers when they bring Virgil into his establishment for food.

Eric is a young man who works as an associate for Enrico, assisting with the administration of the music festival. He feels unsafe with a killer on the loose and takes steps to protect himself and the festival's future.

Mr. Gottschalk is a chemical engineer visiting from out of town. He prefers to drive at night to avoid the daytime heat, which inadvertently casts suspicion on him as he moves through Wells during the murder window.

Frank is a local businessman and the mayor of Wells. He represents the town's political establishment, prioritizing the music festival's economic benefits and the maintenance of the town's segregated traditions over finding immediate justice.

Jess is a welcoming, hard-working Black mechanic in Wells who is saving up to move his family out West. He provides Virgil with transportation and a hospitable space away from the town's hostile white residents.

Andy is Jess's thirteen-year-old son. He is fascinated by Virgil's profession and views the educated, successful Black detective with absolute awe during a family dinner.

Pete is the desk clerk at the Wells police station. He handles communications and coordinates the officers, frequently gossiping with Sam about the investigation's progress and the visiting detective.

Mr. Purdy is Delores's father, a crass and bigoted resident of a poor Wells neighborhood. He aggressively demands action from the police while openly refusing to tolerate a Black detective's presence in the room.

Reverend Whiteburn is an elderly Black minister in Wells. He assists the investigation by mobilizing the neighborhood children to search for a specific piece of evidence disguised as a church activity.