Breath of Frost

http://hip1.sjvls.org/ipac20/ipac.jsp?session=13892S64E65H6.50141&menu=search&aspect=subtab255&npp=20&ipp=20&spp=100&profile=thq&ri=&term=&index=.GW&x=0&y=0&aspect=subtab255&term=Breath+of+Frost&index=.TW&term=Harvey&index=.AW&term=&index=.SW&term=&index=.NW&term=&index=.SE&term=&index=.STW&term=&index=.EW&sort=Breath of Frost by Alyxandra Harvey

When three cousins in 1814 London discover their magical powers and family lineage of witchcraft, they accidentally open the gates to the underworld allowing the spirits of dark witches known as the Greymalkin Sisters to hunt and kill young debutante witches for their powers.