Behind the pristine walls and polished floors of Replyx lies the "treehouse," the place where the gifted are detained, tested, and studied against their will. They have one goal and they are on the brink of discovering what sets Abrielle and all other replicators apart. Abrielle was trapped there for months. She saw what they were capable of and willing to do to fulfill their mission. While Abrielle is hiding in the sanctity of the revered level at Ernvlik Academy, Jeremiah begins to use deadly tactics to bait her. When Abrielle and the other gifted teens come up with a plan, they learn firsthand that if they want to annihilate the treehouse they must be willing to sacrifice everything.