Sam (Sean Penn) has a mental age of seven. He works at a Starbucks and is crazy about Beatles. He has a daughter with a woman who abandons both Sam and the baby the minute she is out of the hospital. Sam names his daughter Lucy (Dakota Fanning) and raises her singlehanded. But when Lucy becomes seven, Sam's limitations become a problem. The authorities take Lucy away from her father. Will...

Sam (Sean Penn) has a mental age of seven. He works at a Starbucks and is crazy about Beatles. He has a daughter with a woman who abandons both Sam and the baby the minute she is out of the hospital. Sam names his daughter Lucy (Dakota Fanning) and raises her singlehanded. But when Lucy becomes seven, Sam's limitations become a problem. The authorities take Lucy away from her father. Will lawyer Rita Harrison (Michelle Pfeiffer) help bring father and daughter together?