I never read any of Leonard Schlain's books but my late husband read them all and became a major fan of Dr. Schlain. He contacted Leonard via email and contributed to some of his theories. They were both diagnosed with the same type of deadly brain tumor at about the same time but I lost my husband after only 6 months. It was with great emotion that I listened to Tiffany talk about her father's illness in the movie last night. But it was heartening to hear how much she learned from her father and how much credit she awarded him. It makes me want to read his books now. This is a film for young adults to super seniors.