| Appears in: | The Adventure of Black Peter |
|---|---|
| Quotation: | "One should always look for a possible alternative, and provide against it. It is the first rule of criminal investigation." |
| Notes: |
| Appears in: | The Adventure of Black Peter |
|---|---|
| Quotation: | "One should always look for a possible alternative, and provide against it. It is the first rule of criminal investigation." |
| Notes: |