The Hallowmere series (published by Mirrorstone/Wizards of the Coast) was a young adult dark fantasy. Set in Reconstruction-era Virginia and moving to Victorian Scotland and London, Hallowmere brought to life both the history of the period and the magical talents of girls brought together to fight the scheming Fey Prince and his minions. 

Titles in the series included:

In the Serpent's Coils (a New York Public Library Book of the Teen Age and IndieNext Pick)

By Venom's Sweet Sting

Between Golden Jaws

Maiden of the Wolf

Queen of the Masquerade

Oracle of the Morrigan