American King (New Camelot Trilogy, #3) by Sierra Simone

From USA Today and Wall Street Journal bestselling author Sierra Simone comes the final installment a steamy new polyamorous romance trilogy with a dash of politics and a pinch of magic. His name is Maxen Ashley Colchester, and he swore a duty to his country. Then, he swore his heart to them. They say that every tragic hero has a fatal flaw, a secret sin, a tiny extra stitch sewn into his future since birth. And here Ash is, President of the United States, a king who was foolish enough to build his kingdom on the bones of the past. His sins are no longer secret. His flaws have never been more fatal. And he's never been closer to tragedy than he is now. After losing Embry, their vice president, their prince, Ash and First Lady Greer must not only run for re-election without the man they love, but against him. Yet even political rivalry and the threat of war cannot unravel the years of fire and longing that tie the three of them together, no matter what that bond might cost them. Their country, their careers, their lives-it's all at risk now. Ash knows love was always meant to be the end of their story: his, Embry's, and Greer's. He just hadn't realized it might be the end of them, too. Long live the king.