Despite the angry scars she carries from her childhood training, Zoe Lorel has reached a good place in her life. She has her dream job as an elite operative in an international spy agency and found her true love. Her world is mostly perfect—until she is sent to abduct a nine-year-old girl. The girl is the only one who knows the riddle that holds the code to unleash the most lethal weapon on earth—the first ever "invisibility" nanoweapon, a cloaking spider bot.

Zoe's agency is not the only one after the child. China developed the cloaking bot and will stop at nothing to keep its code secret. While China rapidly hones in on Zoe, her threats grow. Enemies in Austria and Bulgaria reveal the invisibility weapon's existence to underground arms dealers—now every government and terrorist organization in the world want the nanobot.

From Malta to the Italian Alps to England, Zoe races to save not only the child she has grown to care about, but also herself. Her drug addiction is threatening her engagement to the one person who brings her happiness, yet she needs the agency prescribed pills. They transform her into the icy killer she must be to survive. Can she still be ruthless without the chemicals that suppress her emotions?