Faded Embers - Shadows of War, #4

With the Haederan Empire mostly ousted from Asria, Avery Rendon should feel freer than she has in years-certainly since the Haederan invasion. Yet when she's nearly assassinated on the day of her long-overdue coronation, intelligence suggests the perpetrator is her estranged brother, Quen. He may have denied wanting the throne years ago, but now it seems he wants another shot-and he won't stop until she no longer stands in his way.
Convinced her life is in imminent danger, she flees to Haedera, the last place Quen will ever think to look. But the reclusive planet isn't the sanctuary she was promised, and in the volatile aftermath of the Third Commonwealth-Haederan War, political intrigue is treacherous and allies are few. When Quen tracks her to Haedera and her enemies close in around her, Avery is forced to trust the one man she swore she'd never forgive. And that trust will come at a cost.