The film tells of the birth of one of the most popular songs in Christian rock - "I Can Only Imagine". His author was Bart Millard, who did not have the happiest childhood, but music helped him to cope with all his experiences. At 11, Bart's mother broke up with his family and stayed alone with his father, Arthur. With him, he had a very complicated relationship, but despite the fact that they did not agree with almost any problem, father and son love each other very much. Arthur died when Bart was 18 years old, and years later, his son dedicated his best song.