Ruby Turner lived an everyday life until Jack Cortex showed up. He tells her that a government facility houses an army of super soldiers known as the Subjects of Experiment X and Experiment A. Jack soon unveils to Ruby that she is a vital part of it all and that the head Lab Coat of the facility—Doctor James Thaddeus—is after her. Ruby knows that Jack is dangerous, and she knows he's capable of murder. Still, he's the only person who can help her unlock what's been hidden inside her for nearly twenty-two years. Now the only thing that will keep Ruby's loved ones safe is to help destroy the very thing that created her. And even that might not be enough. A vengeful fire burns deep within her, and she must take down the Lab if she wants to keep the last remaining strands of her sanity. She only needs to make it out alive.

Ruby watched Matt die. And now he’s being announced as a Captain of the world’s deadliest army on live TV. And beside him? Jack. Doctor Thaddeus is back, and he’s recruiting new Subjects—volunteers to become elemental super soldiers to protect the country from impending threats. Ruby knows this means more people will die at the hands of Thaddeus in his mission to create the perfect human weapons. When Ruby and Shawn are captured by Lab-Loyal Subjects, they quickly learn that no one is who they seem. Will Ruby survive the tortures of the Lab, or will she have to become the weapon she was designed to be? What would you do to survive?

Doctor James Thaddeus thinks he’s safe, but Ruby is coming for him. And nothing will stop her this time. The world knows who they are now; they know what the Subjects of the super-soldier Experiments are capable of. Doctor Thaddeus is attacking Ruby’s hometown, decimating beloved sanctuaries, and killing dozens of innocent people while smearing the names of Ruby and her friends. Ruby has complete control of her fire elemental powers now, and she possesses a rage that burns deeper than ever. Ruby’s determined to destroy the Lab once and for all, even if that means ripping it apart, brick by blood-soaked brick.