Light of My Life is both a tender and terrifying film about a father (Casey Affleck) and his daughter called Rag (Anna Pniowsky) that is set in a post-apocalyptic America where a mysterious plague has killed off nearly all women. Rag is now 11 and to keep her safe, her father dresses her as a boy. It’s a good idea for now, but soon may be impossible as she gets older.