| This article needs additional citations for verification .(April 2025) | 
|   | |
| Author | Bruce Cook (writing as Bruce Alexander) | 
|---|---|
| Language | English | 
| Series | Sir John Fielding, #9 | 
| Genre | Historical Crime novel | 
| Publisher | Putnam | 
| Publication date | 2002 | 
| Publication place | United States | 
| Media type | Print (Hardcover, Paperback) | 
| Pages | 288 pp | 
| ISBN | 0-399-14923-6 | 
| OCLC | 49625327 | 
| 813/.54 21 | |
| LC Class | PS3553.O55314 E97 2002 | 
| Preceded by | Smuggler's Moon | 
| Followed by | The Price of Murder | 
An Experiment In Treason is the ninth historical mystery novel about Sir John Fielding by Bruce Alexander [1] (a pseudonym for Bruce Cook).
A pack of confidential letters is stolen from the Secretary of State for the American Colonies. With cross-Atlantic tensions rising, Sir John is ordered to interrogate the American representative in London, one Benjamin Franklin.