A Cadence of Ash. The Resonant Arcana, #7

Four fragments. One impossible war. The battle for the Echo will consume them all. Vesper Ainsley survived the destruction of Saint Aldwin's, but the price was steep. Two ancient fragments of the Echo now burn within her chest, threatening to erase everything she is. And the Arcana will stop at nothing to claim what she carries. Trapped in Praxis's crumbling sanctuary, Vesper fights a losing battle against the fragments consuming her from within.
Each day, more of herself slips away. Each night, the Echo's whispers grow louder. Rafe refuses to give up on her. Blair leads desperate rescue missions across the deadly Darkmese. But when rumours surface of more fragments hidden somewhere in Nightreach's ruins, Vesper faces a terrible truth: the war for the Echo has only just begun. A Cadence of Ash is the seventh book of The Resonant Arcana series.
The hunt is on. The Arcana are closing in. And when the Echo rises, no one will be left standing.