Archenemies by Marissa Meyer

The Renegades Trilogy continues, in this fiercely awaited second installment after the New York Times-bestselling Renegades by Marissa Meyer, author of the Lunar Chronicles. \n \nTime is running out. \nTogether, they can save the world. \nBut they each other's worst nightmare. \n \nIn Renegades, Nova and Adrian (aka Insomnia and Sketch) fought the battle of their lives against the Anarchist known as the Detonator. It was a short-lived victory. \n \nThe Anarchists still have a secret weapon, one that Nova believes will protect her. The Renegades also have a strategy for overpowering the Anarchists, but both Nova and Adrian understand that it could mean the end of Gatlon City - and the world - as they know it.