With an alien invasion and survival of the human race at stake, service in the Marines was no longer simply about honor and duty, it was a matter of life and death. This was especially true for Quinn, a Marine sergeant who was hell-bent on ensuring that her young daughter had a world to grow up in. No one stands a chance, but the invasion isn't what it seems. The others don't see this, but one thing separates Quinn from the others: She’s a certifiable badass. And as the aliens will learn, it’s tough to keep a good woman down.

It's a race against time as the alien invading Syndicate continues their assault on our world. When all hope seems lost, the Space Marines uncover a secret in the form of a time capsule, a temporal totem that contains a message about how to fight back. Emboldened by the discovery, Quinn and the Marines begin hatching a plan to rebel by joining forces with the resistance, the very soldiers they’ve been forced to fight. Meanwhile, Quinn’s daughter has been stranded in the no-man’s land of vanquished cities littered with both friendly and enemy survivors of the invasion. She's forced to grow up quickly in the face of numerous life-or-death encounters, and soon links up with a ragtag group of guerrilla fighters to kick some serious alien butt. It’s not a matter of if mother and daughter's worlds will collide, but when … and once they do, the rebellion against the alien invaders will never be the same.

The battle between the Syndicate alien invaders and the forces on Earth continues. The Space Marines and the Resistance have formed an uneasy alliance, but struggle to put aside old difference as they work to formulate a plan of battle, including a sneak attack on a Syndicate outpost that may hold a clue to turning the tables on the aliens. Meanwhile, Samantha is confronted by a mysterious new figure that recognizes abilities in her that she never knew she possessed. The Potentate watches over everything, biding his time, working feverishly to manipulate the actions of Quinn and the others in the present and in past loops of time. Can Quinn and her warriors stop the Syndicate before the Potentate’s master plan is revealed and put into action?

For the Female of the Species is far more deadly than the male." Rudyard Kipling, said of female lions. After returning from a mission to salvage a time capsule, Quinn and the Space Marines face imprisonment at the hands of a rogue faction of the resistance, and Samantha is taken during her attempts to use her otherworldly abilities to save them. It’s a race against time as Quinn struggles to find a way out of the silo and run a gauntlet through the badlands of Wyoming, where she confronts bands of armed scavengers and resistance fighters who will do anything to stop her from saving her daughter. Will mother and daughter pull through and escape to bring the war to the Syndicate, or will internal conflict signal the end of the fight to save humanity?