Emperor's Assassin Bride - Dazon Agenda, #6

Jordan Saunders has the misfortune of being Emperor Aryk's ideal genetic partner and future mate. The power-mad emperor doesn't care if she wants the union, and he'll use any tactic to claim her. She's appalled when her mother tells her she's brokered a ceasefire with Dazon, but Jordan is the cost of securing the peace. Involved with Sash Darvig, she can't stomach the idea of marrying the ruthless emperor.
Fortunately, her mother has a different plan in mind. She isn't going there to marry him, but to assassinate him. Sash doesn't take the news well and realizes too late Jordan is his mate. By the time he has his epiphany, she's already gone. He's determined to rescue her, but that proves difficult when she won't allow him to "save" her from her critical mission. She has to kill the emperor or die trying, even if it costs her the love of her life.
This is the final installment in the series. For maximum enjoyment, the Dazon Agenda should be read in order.