Edgar Wallace 
Just Men Of Cordova [PDF ebook] 

There are crimes for which no punishment is adequate, offences that the written law cannot redress. The three friends, Pioccart, Manfred and Gonsalez, may be enjoying the exotic, Spanish city of Cordova with its heat and Moorish influences, but they are still committed to employing their intellect and cunning to dispense justice. They use their own methods and carry out their own verdicts. They are ruthless and they deal in death.