Ignite Me by Tahereh Mafi

The fate of Omega Point is uncertain. Everyone Juliette cares about may now be dead—rebels, friends, even Adam. But she won’t let this prevent her from trying to overthrow the Reestablishment. Juliette must rely on Warner, the one person she never thought she could trust and the only person who saved her. He promises to help her harness her powers and save their dying world...but it seems it’s not just what he wants from her.