Here´s a note from Lori and Corey Cole´s web site: http://www.transolar.com/
Note 3:
How does a four-game series become five games?
The ending of “Trial by Fire” indicated that the next game in the series would be “Shadows of Darkness.” However, we had a two year break from the series while we were making Educational games, and we didn’t want to introduce new players to the horror genre of “Shadows of Darkness” until they had played a more traditional fantasy genre. So we added “Wages of War” to balance things out.