Mr. Keen, Tracer Of Lost Persons. January 6, 1944. CBS net. "The Case Of The Moonless Night". Sponsored by: Anacin, Kolynos, Heet, Kriptin, Bisodol, Hills Cold Tabs. Mr. Keen's in the deep South to find a missing southern gentleman on a plantation with black walnut trees. Bennett Kilpack, Frank Hummert (producer), Anne Hummert (producer), Larry Elliott (announcer).