Archenemies (Renegades, #2)
by Marissa Meyer 

3.5 out of 5 stars
Nova is a spy for the Anarchists. She has infiltrated the Renegade headquarters, pretending to be one of them so that she can plot against them. But Nova’s loyalties are divided as she finds herself more and more involved with Adrian, a young superhero whose two dads are the leaders of the Renegades. In this second book of the series, Nova is starting to really feel the pressure of her double life as the violence in the city escalates.