The city of London is beginning to rebuild from the ashes of the Third World War. Ruled by the fascist Libertas Party, the city is a desolate landscape of crime, corruption, and illegal genetic modification that turn humans into animalistic mods. Ineffectually policed, mods blend into normal society by day and rule the ruins beyond the city limits at night. People frequently go missing in this world, and those who want to survive must close their eyes to the crimes committed on their streets. 

Within the city lives Liane, a girl trained since childhood to be an unfeeling, unthinking killing machine known as an Agent. Beautiful and deadly, Liane exists in a world of constant surveillance and brutality, living only to carry out the orders of the all-powerful Agency. This secret government organization enforces the laws of Libertas, killing anyone who threatens the tenuous peace within the country. Liane’s only human contact comes in the form of her Handler, Damian, who demands perfect obedience from her and desires for them to be far more than Agent and Handler. Chafing under the rules of the Agency, Liane secretly longs for a normal life and steals away to the ruins to spend time with the mods. 

But when mods begin to turn up murdered and mutilated around the city, Liane finds herself wanting to help protect the people who have been her only friends. Working alongside Seth, a young police officer on the Genetic Modification Task Force, Liane defies her Handler in an effort to find the killers. Together, Liane and Seth weave their way through the dark world of cyberpunk London, following whispers of the next genetic advancement known as the Titan Strain.