From the back of the book, all [sic] :
As Mars comes into Conjunction with Saturn it heralds...
A Time of War!
A perilous undead army of vast size is on the march poised to devastate the Kingdom of Reisenreich. With every attack this army grows stronger. With every raid the army grows grows larger. ...and its leader is not as interested in victory as he is in revenge. Only one thing stands between this foul brood and the end of human kind:
Revenge of the Fire Giant may be played as a stand alone scenario, or as the sequel to Harbinger. Although designed for the World of Okkorim, it may be readily adapted to an campaign and is compatible with most fantasy role-playing systems.