Shadows of the Apt, book 07: Heirs of the Blade
Adrian Tchaikovsky2011

She remembered how it felt to lose Salma, first to the wiles of the Butterfly-kinden girl, then to hear the news of his death, abandoned and alone in the midst of the enemy. She remembered how it felt to see her father hacked to death before her eyes. But of her murder of Achaeos, of the bite of her blade into his unsuspecting flesh, the wound that had sapped him and ruined him until he died, she remembered nothing, felt nothing. In such a vacuum, how could she possibly atone? Tynisa is running, but she cannot escape the demons of her own mind. Amidst the fragmenting provinces of the Dragonfly Commonweal her past will at last catch up with her. Her father's ghost is hunting her down. At the same time, the Wasp Empress, Seda, is on the move, her eyes on the city of Khanaphes, the fallen jewel of the ancient world. Whilst her soldiers seek only conquest, she sees herself as the heir to all the old powers of history, and has her eyes on a far greater prize.