Edgar Wallace 
Terrible People 

A secret society takes deadly revenge on London law enforcement in this 1926 mystery novel by the pioneering crime author.Inspector Arnold “Betcher” Long was the only man in London who could bring Clay Shelton to justice. Though the murderer and master forger threatened to get his revenge, his execution by hanging put a definitive end to the case. Or so everyone thought. When the judge who sentenced Shelton is murdered, Scotland Yard takes notice. And after Shelton’s prosecutor and executioner are all killed by a shadowy organization known as “The Terrible People, ” Betcher knows his turn is coming. But how do you stop a murder conspiracy orchestrated from beyond the grave?