A galactic war is raging, and no one has noticed that an even more dangerous threat – as ancient as the universe itself – is preparing to carry out its dreadful plan.
Twins Kass and Tycho believe they have the solution, but powerful forces will try to stop them from succeeding. The battle to stop the ruler of the underworld presents the twins with their greatest challenges yet: hidden enemies, solar storms, galactic assassins, and worst of all – love.
“The Ruler of the Underworld” is the grand finale in the series about Kass and Tycho.
