| Name | Alden, Henry |
| Gender | Boy |
| Occupation | Student |
| Trait | Orphan |
| Name | Alden, Jessie |
| Gender | Girl |
| Occupation | Student |
| Trait | Orphan |
| Name | Alden, Violet |
| Gender | Girl |
| Occupation | Student |
| Trait | Orphan |
| Name | Alden, Benny |
| Gender | Boy |
| Occupation | Student |
| Trait | Orphan |
| Genre | Fiction Juvenile Mystery |
| Topics | Orphans Brothers and sisters Vacations Rare books Theft |
| Setting | Niagara Falls, New York |
| Series | ||
| Boxcar Children Special | ||
| 1 | The Mystery on the ice | |
| 2 | The Mystery in Washington, D.C. | |
| 3 | The Mystery at Snowflake Inn | |
| 4 | The Mystery at the ballpark | |
| 5 | The Pilgrim Village mystery | |
| 6 | The Mystery at the fair | |
| 7 | The Pet shop mystery | |
| 8 | The Niagara Falls mystery | |
| 9 | The Mystery in the old attic | |
| 10 | The Windy City mystery | |
| 11 | The Mystery of the queen's jewels | |
| 12 | The Mystery of the black raven | |
| 13 | The Mystery in New York | |
| 14 | The Home run mystery | |
| 15 | The Honeybee mystery | |
| 16 | The Mystery of the screech owl | |
| 17 | The Mystery of the tiger's eye | |
| 18 | The Candy factory mystery | |
| 19 | The Mystery of Alligator Swamp | |
| 20 | The Great Shark mystery | |