In bunkers and strongholds across the world, people are celebrating. There's a vaccine to the virus that has ravaged the planet for years. But the celebrations won't last for long. The vaccine isn't working. The virus is evolving. Catarina - genehacker, reluctant warrior - must find the one person who can help her. A man who is guilty of unimaginable crimes. Time is ticking, she only has three days before shadowy gentech corporation Cartaxus will use lethal code to wipe out every person on the planet's surface. Kill the hosts, kill the virus. Forced to question everything she knows and everyone she trusts, Cat discovers that the biggest threat of all may be buried in her own mind.