“Never let them take you. No matter what happens, stay away from Cartaxus.” 

Those are the last words that Catarina Agatta heard from her father before he was taken from her by the agency known as Cartaxus. That was about two years ago.

In a tech-filled world ravaged by a mysterious and deadly virus called “Hydra,” Catarina has struggled to survive. Outside of Cartaxus’ safe-house bunkers, the world is harsh, but the hardships are worth it to her, as long as she is able to fulfill her father’s last wish. One day, though, as she is settling back into her cabin after a special kind of hunt, a Cartaxus agent comes to take her but brings heartbreaking news. He tells her that her father died, but before he did, he finished making a vaccine for the virus. The problem is it’s encrypted and Catarina is the only one who can crack the code. 

Now Catarina must decide whether to continue hiding from Cartaxus or trust this mysterious soldier and the words of hope he brings.  Even if she does trust him, how is she to go about cracking the code that even Cartaxus’ master hackers couldn’t solve?