Zodiac Speaking explores the infamous Zodiac Killer case which is one of America's greatest unsolved Mysteries. Hosts Mike Morford and Richard Grinell have spent thousands of hours analyzing every aspect of the Zodiac case, and in each episode of Zodiac Speaking, they explore a different piece of the mystery. Whether you are new to the Zodiac case, or well-versed in its lore, listeners are bound to learn something new.