Black Cat Bone

"To make the black cat bone, you have to boil the cat alive. You have to listen to it die in agony and wait until the meat falls off the bones. You have to take the bones and face your own reflection in a mirror while you put each bone between your teeth. When your reflection disappears, when you're invisible, that's the bone you want; you throw the rest away. So to make a cross to trap your heart's beloved, you have to do it twice.
I figure any witch hateful enough to do that deserves whatever lover she calls up. And maybe her daughters do, too."
Fresh out of rehab with no hopes for the future, Mary Grace has come home to care for her dying granddaddy at the family homestead, a crumbling plantation house. She's always known the family had a nasty past. But in the ruin of an old church on the property, she finds and unleashes their deadliest secret of all.