This follow-up to Revolution 19 (2013) goes the way of sequels like Veronica Roth's Insurgent (2012) and Lauren Oliver's Pandemonium (2012) by following our heroes out of their Big Brother worlds and into scrappy rebel camps. Rosenblum quickly splits up our siblings: Kevin is taken to the safe haven of "the Island," where bots are actually used for good; Nick joins a Freepost only for it to be attacked; and Cass undergoes brainwashing at the hands of the nefarious City. This is by the numbers (newcomers are mistrusted, unexpected lineages revealed, and love triangles begun), but it is satisfyingly executed and comes with plenty of adolescent snark: "Kiss my fleshy human butt."

Nick, Kevin, and Cass (Revolution 19) escape from the robot city but become separated. With the human and robot war closer than ever, the siblings must survive, find each other, and save the human race. While the book does little to further the series' plot line, Rosenblum smoothly handles multiple narrators, offering readers a full picture of the dangerous world.