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| Author | Bruce Alexander |
|---|---|
| Language | English |
| Series | Sir John Fielding, #4 |
| Genre | Historical Crime novel |
Publication date | 1998 |
| Publication place | United States |
| Media type | Print (Hardcover, Paperback) |
| Pages | 336 pp |
| ISBN | 0-425-16566-3 |
| OCLC | 39982989 |
| Preceded by | Watery Grave |
| Followed by | Jack, Knave and Fool |
Person or Persons Unknown is the fourth historical mystery novel about Sir John Fielding by Bruce Alexander.