The Osiris Contingency (Genetics Chronicles)

Within London of the future, there are no limits to genetic engineering, and a war is brewing between altered humans, known as mods, and the genetically modified assassins of the sinister Agency. Liane, an Agent gone rogue and on the run from her former masters, barely survived the last attack by the Agency. Still grappling with the truths she learned about the Titan Strain, Liane vows to destroy those who turned her into an inhuman killer. But that means outsmarting and outrunning her former Handler, who wants his Agent back at any cost. With the Osiris Contingency threatening ruin for them all, Liane will find herself faced with an impossible choice between freedom and survival.