For troubled courier pilot Fabian Lite, paying off a simple debt turns into a nightmare when he falls foul to a ruthless mafia known as the Klan. Lured to Jupiter's oceanic moon, Europa, Fabian is trapped in the submerged base of Underworld and forced to help the Klan harvest a powerful drug. In the gloomy depths of the most fearful place in the solar system, Fabian finds himself up against criminal warlords, Earth's special forces and a creature that cannot be killed. Unwittingly, he is the only one that can save Mankind from its most disturbing threat in history, the only one that understands Europa's deadly secrets...