A man selling a knife sharpening service is murdering his customers. Original Air Date: January 10, 1949 Take our listener survey: http://survey.greatdetectives.net Become one of our friends on Facebook... http://www.facebook.com/radiodetectives Call 208-991-4783 to leave a voicemail. Click here to download, click here to add this podcast to your Itunes, click here to subscribe to this podcast on Zune,…