Two Dark Reigns by Kendare Blake From Goodreads: While Arsinoe, Mirabella, and Katharine all have their own scores to settle, they aren’t the only queens stirring things up on Fennbirn Island. Queen Katharine has waited her entire life to wear the crown. But now that she finally has it, the murmurs of dissent grow louder by the day. There’s also the alarming issue of whether or not her sisters are actually dead—or if they’re waiting in the wings to usurp the throne. Mirabella and Arsinoe are alive, but in hiding on the minland and dealing with a nightmare of their own: being visited repeatedly by a specter they think might be…