The lanky young evangelist from North Carolina was starting to attract media attention by the end of his 1949 tent revival in Los Angeles -- which means that professionals recorded his sermons.

So historians know exactly what the Rev. Billy Graham said during the sermons that changed Louis Zamperini's life. And because of author Laura Hillenbrand's 75-plus interviews with the Olympian and World War II bombardier, millions of readers know what happened inside his heart during the altar call.

In her 2010 bestseller "Unbroken," she wrote: "Why, Graham asked, is God silent when good men suffer? He began his answer by asking his audience to consider the evening sky. … 'I see the stars and can see the footprints of God. … I think to myself, my father, my heavenly father, hung them there with a flaming fingertip and holds them there with the power of his omnipotent hand … and he's not to busy running the whole universe to count the hairs on my head and see a sparrow when it falls, because God is interested in me.' "

Zamperini flashed back to his 47 days in a lifeboat after crashing in the Pacific, including the moment when he stared at the heavens and whispered: "If you will save me, I will serve you forever." Stunned, he tried to flee the tent, but Graham said: "You can leave while I'm preaching, but not now. … Every head bowed, every eye closed."

There's no way around the fact that this was the moment when Zamperini escaped his demons, said Matt Baer, producer of the 2014 movie "Unbroken" and of the new "Unbroken: Path to Redemption."

"At the end of the day, this is a true story," said Baer. Thus, they needed to show Graham in the pulpit and Zamperini on his knees, because "this was Lou's life. This was what happened. We had to show -- in a cinematic fashion -- that this is when his life changed."

This does, however, create a problem for a Hollywood moviemaker. The 2014 film directed by Angelina Jolie contained the camera-friendly scenes in which Zamperini competed in the Olympics, encountered Adolf Hitler, fought sharks in the Pacific and triumphed after brutal standoffs with prison-camp commander Mutsuhiro "The Bird" Watanabe.

The movie "Unbroken" ended with Zamperini coming home. That's where "Unbroken: Path to Redemption" begins, with a broken hero trying to wash away Post-Traumatic Stress Disorder nightmares with bottle after bottle of beer and whiskey.