The Secret Witch — Alyxandra Harvey

The “gorgeously gothic and gripping” YA fantasy novel about three witchy young women in Regency London who discover both their legacy and their destiny (The Guardian).

For Emma and her cousins Gretchen and Penelope, the stuffiness of 1814 London society is simply unbearable -- even as Emma wishes the roguish Cormac Fairfax would pay her any kind of attention.
 
But that all changes when Emma accidentally breaks a glass memento left to her by her mother. Suddenly, all three young women find themselves gifted with powers of witchcraft -- and they will most certainly need them.
 
For they have unwittingly unleashed a scourge upon London: an evil coven whose powerful members gain their strength from killing young witches.
 
And Emma has just caught their very unwanted attention . . .
 
In this fun, frightful, and thrilling tale, Alyxandra Harvey invites you to be enthralled by her “elaborate fantasy world filled with whimsy, magic, and love” (Publishers Weekly).
 
The Secret Witch is the 1st book in the Witches of London Trilogy, which also includes The Whisper Witch and The Bone Witch.