Grayson 'Echo' Velez is a ghost among ruins, a shadow slipping between the cracks of the dead world. As the Insurgent's Runner, he navigates the decaying cityscapes and frozen wastelands with a speed and precision few can match. When supplies are needed, when messages must be delivered beyond the infected zones, when something—or someone—needs to be found, Grayson is the one they send. He doesn’t hesitate. He doesn’t stop. Because stopping means death.