Kate thought the world was finally safe from Rex and the powerful, terrifying others - but was it? Working together, Kate Stellute, Sinclair, Jo-Ellen, and Rex successfully implemented a risky plan to make space safer for everyone and everything. Kate hoped the others would accept the results and stay away. But when she learns the details of why Rex caused a global mass shooting, she realizes their plan may not have worked after all. Rex suggests a way to protect Kate and her loved ones if the others decide to destroy what is left of humankind, but can Kate trust the violent alien that has already killed millions of people? If she wants to prevent more violence, Kate will need a new plan and new allies if she is to find a way to save the human race from more extraterrestrial wrath.