Live to give, give to live. That is the mantra of a Worker. Tree, the penultimate book in the Numbered series, hypes up the tension in the lead up to the final dramatic climax; the struggle for freedom. The run up to the election is proving a dangerous time in Lunar City for presidential candidate Jonathan, Aurelia and their Resistance friends. When Aurelia is shot at an Elite function, the crew decide that it's time to head back to Earth to escape the melting pot and to recruit more members to their cause by revealing Jonathon as the leader to the Resistance. Hopping between the contrasting environments of the five remaining Earth cities, finding old friends and new hopes, isn't quite enough to keep Aurelia distracted from what she knows as the brutal truth: they are on the cusp of a revolution and sometimes you have to lose individuals to save the masses.