Watch Know Fear (2021) HD Full Movie Free on solarmovie.do. Watch Know Fear (2021) online free. After the possession of his wife, Donald Capel and his family activate a dangerous ritual in a book ...After the possession of his wife, Donald Capel and his family activate a dangerous ritual in a book used to identify and banish demons, a ritual forcing each member of the family to communicate with the demon in their own unique way: to see it, hear it, or speak to it.