A Breath of Frost by Alyxandra Harvey

Emma Day and her two cousins, Gretchen and Penelope, are uninterested in their debutante lives. All the boring balls, tiresome curtsying and polite conversation leave much to be desired. Then a girl is found dead, frost clinging to her lifeless body, and the murder is traced to Emma. As their world is turned upside down, Emma discovers more about herself and her cousins, from her connection to the murders to the secrets of her family legacy. Now the girls must embrace their true Lovegrove inheritance in order to stop the chaos, even if that means risking their lives. Dangerously handsome Cormac Fairfax wants to help Emma - but, with secrets of his own to hide, can she trust him? The first book in a deliciously dark new trilogy. Perfect for fans of Cassandra Clare and Ruth Warburton.