A horror book that is subtle and horrific in it's slow build and instances that are unsettling. Plus, twins. Twin girls that are about 6. They don't do anything creepy like kill, but they're disturbing enough. For someone without kids who doesn't want them, kids who act strangely and make life difficult are always a good, stressful, horror factor.

I kept on being reminded of the Paranormal Activity series when you learned about the coven. Not quite what is happening here but definitely a similar feel!