A hidden city called Leviathan lies deep within the dark trenches of the Pacific Ocean. The city is home to a community of immortals that sought to create a utopia over 1,000 years ago. For a millennia, they lived in peace and secrecy, gently influencing world events to aid the advancement of mankind. But a terrible secret has been kept deep within the catacombs of Leviathan that threatens the existence of the immortals, and quite possibly the entire world.
One woman named Macallan Orsel, a young genetic scientist in New York, discovers she is descended from a group of immortals that rebelled against Leviathan and are now waging a civil war around the globe. As the immortal war spills into the realm of mortal man, Macallan realizes that she holds the key to stopping the battle and bringing peace to Leviathan. But a clandestine government agency called The Blackdoor Group is trying to exterminate the immortal population and has identified Macallan as their critical target.