"Down these mean streets a man must go who is not himself mean, who is not tarnished nor afraid." That man, of course, is Philip Marlowe. Here, as played by Gerald Mohr, he must unravel the mystery of the orange dog.
Marlowe began on radio on NBC with the title role going to van Heflin. In 1948 it moved to CBS with Gerald Mohr taking over the character for all but one of its 114 episodes (for that one episode william Conrad filled in).