Caitlin Starling 
The Oblivion Bride [EPUB ebook] 

A deathly magic. An arranged marriage. A curse in the blood.

In the glittering city state of Volun, Lorelei Steddart never thought she’d be anything but an office drone-until her family all die under mysterious and likely magical circumstances, leaving her to inherit everything. To figure out what’s happened, her uncle marries her off to the city state’s top War Alchemist, Nephele Corisande, an intimidating older woman who might just be able to save her. But what starts as a marriage of pure convenience becomes something deeper. Soon Lorelei and Nephele must untangle a terrible magic that has metastasized into something new and unstable, born in Lorelei’s blood.

Part of the Neon Hemlock Novella Series.