While it hasn't been officially confirmed, there are a lot of hints that Bring Her Back is set in the same universe as the Philippou Brothers' first film, Talk To Me. Both movies involve the occult. Both deal with a deep exploration of grief and mental health, as well. It would make perfect sense to me that the two co-exist in the same world, and that a sequel to Talk To Me will be the one to confirm this by merging details from both films.
