After their climactic battle against Darth Krayt, Cade and his crew are hurtling through a lightning storm with mortally wounded Imperial Knight Azlyn Rae and Jedi Knight Shado Vao. They hope to reach the planet Kiffer, where Bantha Rawk might help with Cade's seemingly impossible plan to save Azlyn. The Sith, too, are handling the aftermath of the battle on Had Abbadon. Some will awaken to find the battle did not end as they believed . . .
With the objective of exterminating the entire Mon Calamari species, the Sith have created a semisentient bioweapon, a creature that can kill selectively.
This Sith leviathan has already been unleashed on one underwater Mon Cal refugee camp, and it now swims the waters of Dac searching for more victims. The Mon Cal Rangers, with the help of Imperial Knight Treis Sinde, must find a way to destroy the leviathan before it clears the remaining Mon Calamarians from the galaxy forever!