The heroic story of Helmuth Hübener, a teenage Latter-day Saint activist who was executed in 1942 for distributing leaflets trying to warn Germans about the lies of Hitler, is familiar to many members of The Church of Jesus Christ of Latter-day Saints in the United States and abroad. He has been the subject of plays, articles, books and a documentary. For those who still don’t know about Hübener, now there is a feature film, “Truth & Treason,” that recounts his harrowing experience of faith and courage. What is fact and what is fiction in the film? More important, what is...