When scientists detect a signal from another galaxy, it is irrefutable evidence of intelligent extraterrestrial life. With bated breath, the global population awaits more touch. They will not be kept waiting for very long. In a matter of days, a horrific strike nearly annihilates humankind, leaving only isolated pockets of people in an eerie wasteland. As aliens seek and kill the last humans, the survivors have a burning question: who are these assailants and why are they hellbent on our annihilation?