At only ten-years-old, Theodora Cross snuck into a high security facility. Rather than punishment, the birth of Agent Zero took place. Now, over a decade later, an extremely difficult mission gets thrown into Sebastien Salter's lap, he and his team are told that they will need an extra agent, despite being the best five within the association. Proving to be anything but a myth, Agent Zero steps out of the shadows to help take down one of the biggest threats the agency has come across; someone who she never thought she would see.