"The captivating story behind the bestselling single in the history of Christian music--and the man who wrote it...MercyMe's crossover hit, "I Can Only Imagine," has touched millions of people around the world. But few know about the pain, redemption, and healing that inspired it. Now Bart Millard, award-winning recording artist and lead singer of MercyMe, shares how his dad's transformation from abusive father to man of God sparked a divine moment...