"Jack O'Judgment" is a classic thriller novel by the inimitable Edgar Wallace. The memorable crime story revolves around a masked vigilante, who wreaks havoc among a successful gang of organised London blackmailers, leaving only a Jack of Clubs as a trace that he was there. The star of the novel is a male protagonist that is both light-hearted and frivolous, as well as cruel towards injustice and the larger-than-life villains. Just like in "The Four Just Men", Wallace arguably promotes vigilantism as the only solution to a feeble justice system. An excellent mystery that leaves the reader guessing in suspense about the identity of the elusive masked man, perfect for lovers of the likes of Sherlock Holmes.