There is a mystery in this book but it isn't your typical sort. Col. Dan Boundary runs one of the most pervasive and ugly criminal organizations in England and the police are having a hard time getting enough hard evidence to convict him. But Jack O' Judgment, a masked and caped figure, doesn't need courtroom proof - he will extract his own justice. But who is Jack O' Judgment? That is the mystery.

I have noticed before in Edgar Wallace (in the "Four Just Men" series for example) that he appears to advocate vigilantism. Unlike most early 20th century crime/mystery writers, his books don't necessarily affirm that society's justice systems (police, lawyers, courts) will prevail and uphold the good over the evil. ( )