The Guilty Witnesses — John Newton Chance

Jonathan Blake had become involved in finding out just who had stolen a precious statuette. A gang of amateurs had so clever a plot that they had attracted the attention of a group of international spies, who habitually used amateurs as guide dogs to secret places of treasure and other things. Then, of course, the amateurs were disposed of. Jonathan Blake found himself being shot at because the guide dogs had lost their way...