I remember this one like it was yesterday - after so many years. I remember it being called CBS Radio Adventure Theater. Both names ran at the same time and when they played it in the evening, it was "Mystery Theater". I remember this from an afternoon playing and we would listen in our VW van and on mono AM with one speaker. If we got where we were going before the show was over, we ran into the house and grabbed our pocket AM radios and hoped there was enough battery left so we could figuire out who dunnit! My parents said it ws similar to the Francis the Talking Mule movies, but I never saw any of them until years later. i remember reruns of Mr. Ed though and this tale made me think of them. Where are the talking horse tales today? 
 