Hellcat by Alexandra St Pierre

Shem and Gabe have arrived in Salem. They’re searching for Hecate, the Mother of Witches, who has hidden herself in a mortal body.
Hecate and Shem have been engaged in a ruthless game of cat and mouse for millennia, and Shem is determined to have his revenge for the whole ‘Henry the Eighth’ prank she played on him in the 1500s.
However, their game takes a sinister turn when an angel from Shem’s past appears and throws the entire town into a state of panic.
As Shem struggles with the ghosts of his past, Gabe does everything in his power to keep Shem from losing himself to the darkness that haunts him.
Will Gabe be enough to help Shem escape his demons? Or will his past prove to be too much for them to overcome?