School Library Journal
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Gr 8 Up—In Gearbreakers we learned that victory has a steep cost; this follow-up begins after the devastation of Heavensday with Eris still imprisoned and Sona alive but barely the girl Eris loves. The Gearbreakers had nearly succeeded, but with a Zenith still pushing Godolia into executing its Windup Pilot Program and our main characters back on opposite sides of the war. The narrative mirroring of the first book one raises the stakes rather than feel repetitive, and the tight worldbuilding keeps readers hooked as our heroines work to find their way back to each other. Mikuta plays with tropes throughout the series and executes her action sequences to great effect, but some readers may find the pacing of this one heavy on battle scenes. VERDICT This mecha dystopian has a diverse, witty cast; a worthy purchase for libraries that own Gearbreakers.