The Witches of London Series by Alyxandra Harvey

In 1814, three cousins—Gretchen, Emma, and Penelope—discover their family lineage of witchcraft when a binding spell is broken, allowing their individual magical powers to manifest. Now, beyond the manicured gardens and ballrooms of Regency London, an alluring underworld available only to those with power is revealed to the cousins. By claiming their power, the three cousins have accidentally opened the gates to the underworld... moreIn 1814, three cousins—Gretchen, Emma, and Penelope—discover their family lineage of witchcraft when a binding spell is broken, allowing their individual magical powers to manifest. Now, beyond the manicured gardens and ballrooms of Regency London, an alluring underworld available only to those with power is revealed to the cousins. By claiming their power, the three cousins have accidentally opened the gates to the underworld. Now ghouls, hellhounds—and most terrifying of all, the spirits of dark witches known as the Greymalkin Sisters—are hunting and killing young debutante witches for their powers. And, somehow, Emma is connected to the murders…because she keeps finding the bodies. Can the cousins seal the gates before another witch is killed…or even worse, before their new gifts are stripped away? less

Cousins Gretchen, Emma, and Penelope are all dealing with what it means to be a Lovegrove. For Gretchen, it means she often feels like her head is going to explode. As a Whisperer, Gretchen constantly hears the whispers of other witches' spells. And while this does help her to know when one of her own spells is going wrong, the incessant buzzing and pain the whispers cause makes it difficult to use her gift... moreCousins Gretchen, Emma, and Penelope are all dealing with what it means to be a Lovegrove. For Gretchen, it means she often feels like her head is going to explode. As a Whisperer, Gretchen constantly hears the whispers of other witches' spells. And while this does help her to know when one of her own spells is going wrong, the incessant buzzing and pain the whispers cause makes it difficult to use her gift.But when something evil begins to menace Mayfair, Gretchen must find a way to master her power. Along with her cousins, a madcap named Moira, and the icy yet irresistible Tobias Lawless, Gretchen faces deadly threats and unimaginable loss in the hopes of preventing the terrible Greymalkin Sisters from rising again.The second book in The Lovegrove Legacy trilogy, Whisper the Dead will leave readers spellbound. less

The novella conclusion to the Lovegrove Legacy!London is under attack.Can Emma, Gretchen, Penelope find their way back to each other in order to defeat the Seven Sisters once and for all?(Note: novella)Available on Smashwords