Cydonia (Book 4 - Windfire Series) by Tamsin Silver
Approx. 68,130 words.
Published on October 3, 2012.
Jensine, Hunter, and Josh arrive at Cydonia, Valencia’s secret commune of hybrid soldiers in training, only to find themselves face to face with a hybrid army primarily comprised of teenagers.
On the run from The Great Order Royal Guard, Atlanta and Gray head to New York City. To avoid capture, they deviate from the original plan and decide to stay with friends in Manhattan.