Trust the Saint by Leslie Charteris
In these six stories, the Saint encounters monsters of both the human and the animal variety: unscrupulous fraudsters in Hamburg; a confrontation with a rhino; perfect murders in Paris; a temperance leader deserving to be taken down a peg or two; a thief duping tourists in Sweden; and the hunt for the most famous monster of them all on the shores of Loch Ness. You can trust the Saint to deal with anything life throws at him with charm, imagination and steely determination...