Cinder’s whole world is held together and supported by threads no stronger than glass. Killing is the one thing she excels at. But it’s hard to hit her mark when she’s not sure who to kill first. Returning to her brother without King Tristan’s head wasn’t the plan. Yet that’s exactly what Cinder does. Worse, she asks him to unite with Tristan’s forces to fight for the kingdom. Her brother is an accomplished murderer, what will he do when she admits to lending her blade to Tristan’s cause? Will she become the next target for assassination? Will all the glass threads shatter?