This article relies largely or entirely on a single source .(November 2019)  | 
|   | |
| Author | Edgar Wallace | 
|---|---|
| Language | English | 
| Genre | Thriller | 
Publication date  | 1920 | 
| Publication place | United Kingdom | 
| Media type | |
| Pages | 302 | 
| ISBN | 1790400023 | 
Jack O'Judgment is a 1920 thriller novel by the British writer Edgar Wallace. It features a vigilante who takes action against a gang of blackmailers, using a mysterious identity and leaving the Jack of Clubs as a calling card. [1] [2]
It is considered to be Wallace's best effort in this genre. [3]