Tartarus

Long ago , the Olympian Gods conquered and nearly destroyed an earlier race known as the Titans. Echidna , Mother of Monsters , was imprisoned in Tartarus. Centuries later , she has escaped. Entering the modern world , Echidna finds the old Gods are gone , and vows to destroy every descendant of the Olympians. In the contemporary Pacific Northwest , Adrian and Annelise have lived comfortably—unaware of their Olympian birthright and its significance. When Adrian is introduced to Zack , sparks fly and their initial contact slowly turns to romance. Echidna unleashes a brutal attack and Zack reveals his Divine lineage. Now he must teach the twins about their own heritage , and how to wield their unique powers for the battle to come. The final battle between Titans and Olympians will be held in the Underworld. Modern weapons have no place and only magic can prevail.