Hymn Of The Hollow

From publisher blurb:

In Kasumoto, the high-walled city of wind-chimes and crimson thresholds, the clash of silent feet and honed steel echoes more deeply than any war-drum. For centuries, House Velmiras, a dynasty of swordmasters, held sway in the twilight courts. Yet now, a serpent stirs. From behind lacquered masks and incense-darkened halls, the House of Kal-Naresh, assassins of whispered ancestry and blood-bound covenant, strikes like moonless rain. Between them lies not merely vengeance, but the city’s secret heart: a scroll lost to time, said to contain the names of all who have worn death’s mark—and all who must.