| Helen | Albury | Robert's sister. |
| Robert | Albury | Assistant cashier. |
| Dinah | Brand | Thaler's girlfriend. |
| Ike | Bush | A fighter. AKA: Al Kennedy. |
| Tom | Cook | Senator Keefer's son-in-law. |
| Charles Procter | Dawn | A criminal lawyer. |
| Hickey | Dewey | The narrator's acquaintance. |
| Mr. | Dritton | The cashier. |
| Dick | Foley | Continental Op's colleague. |
| Jerry | Hooper | One of Thaler's friends. |
| Myrtle | Jennison | The girl that Tim likes. |
| Stanley | Lewis | Elihu's secretary. |
| Mickey | Linehan | Continental Op's colleague. |
| Bob | MacSwain | A former policeman. |
| Old | Man | Continental Op's boss. |
| Peak | Murry | One of the suspects in Tim's case. |
| Tim | Noonan | Noonan's brother. Murdered. |
| Hank | O'Marra | A member of Starkey's gang. |
| Continental | Op | Protagonist. AKA: Henry Neill. |
| Bill | Quint | Organizer of I.W.W. |
| Dan | Rolff | Dinah's housemate. |
| Detective | Shepp | McGraw's detective. |
| Reno | Starkey | Lieutenant in Yard's gang. AKA: Oliver. |
| Max | Thaler | A gambler and gangster. AKA: Whisper. |
| Pete | The Finn | A gangster. |
| Donald | Willson | Murdered. A Herald Publisher. |
| Elihu | Willson | Donald's father. |
| Mrs. | Willson | Donald's wife. |
| Ted | Wright | Whisper's friend. |
| Lew | Yard | A loan shop owner. |
| Biddle | | One of the policemen. |
| Dart | | A young lawyer. |
| Keefer | | The senator. |
| Lewis | | Stanley's daughter. Don's secretary. |
| McGraw | | Noonan's lieutenant. |
| Nick | | Thaler's friend. |
| Noonan | | The chief of police. |
| Vanaman | | Shepp's partner. |