Poor Marty Fischer; he's been found dead, supposedly attacked by wolves in Clarksville National Park. Now the FBI, CDC, Park Rangers and Local law enforcement have all scrambled to find out why an innocent tramper could have been killed in such a way. As a result, as the Autumn weather closes in, the characters are about to discover what it really means to be "under a Harvest Moon".

Harvest Moon uses the Esoterrorist system - You are elite investigators combating the plots of the Esoterrorists, a loose affiliation of occult terrorists intent on tearing the fabric of the world. The Esoterrorists introduces the GUMSHOE rules system, which revolutionizes investigative scenarios by ensuring that players are never deprived of the crucial clues they need to move the story forward.