Admired and praised by the likes of Irving Berlin and Cole Porter, Johnny Mercer has been described as "one of our great folk poets" and "the most perfect American lyricist". Throughout his extraordinary career, he collaborated with hundreds of composers to write legendary movie songs such as "Hooray for Hollywood", "Jeepers Creepers" and "Moon River". Mercer then went on to co-found Capitol Records in 1942 and became a successful Broadway producer of St. Louis Woman and L'il Abner.
Christine Collins is overjoyed when her kidnapped son is brought back home. But when Christine suspects that the boy returned to her isn't her child, the police captain has her committed to an asylum.
Despondent over a painful estrangement from his daughter, trainer Frankie Dunn isn't prepared for boxer Maggie Fitzgerald to enter his life. But Maggie's determined to go pro and to convince Dunn and his cohort to help her.