In 1993, Sam Dawson, a
Starbucks barista with an
intellectual disability, becomes the single father of Lucy Diamond Dawson, named after
the Beatles song "
Lucy in the Sky with Diamonds", following her abandonment by her mother, a homeless woman with whom Sam had sex, who had no interest in having her. Sam is well-adjusted and has a supportive group of friends with disabilities as well as a kind,
agoraphobic neighbor, Annie, who takes care of Lucy when Sam cannot. Nearly a decade later, in 2001, Sam provides a loving place for precocious Lucy, though she soon surpasses his mental capacity and ability. Other children bully her for having an intellectually disabled father, and she becomes too embarrassed to accept that she is more intelligent than he is. In danger of losing
child custody, Sam gets advice from his friends and also hires the lawyer Rita Harrison, whose absorption in her work, and neglect of her son Willie, reveals she also struggles with her role as a parent. In an attempt to prove that she is not cold, Rita agrees to take on Sam's case
pro bono. As they work to secure Sam's rights, Sam helps Rita see her own life anew. This includes encouraging her to leave her philandering husband and repair her fractious relationship with her son. At the trial, Rita makes some convincing arguments while questioning a few different witnesses, including Annie. However, the prosecutor puts so much pressure on Sam that he breaks down, after becoming convinced he is not capable of raising Lucy. Afterward, Lucy resides in a
foster home with Miranda "Randy" Carpenter but tries to convince Sam to help her run away. Sam moves to be near Lucy, so she continually leaves in the middle of the night to go to his apartment, though he immediately returns her. The foster parents, in the end, decide not to adopt her as they had planned, and return her to Sam. Randy assures him that she will tell the judge he is the best parent for Lucy. In turn, Sam asks Randy if she will help him raise Lucy because he feels she needs a mother figure. The final scene depicts a
soccer game, in which Sam referees and Lucy participates as a player. In attendance are Lucy's former foster family, Sam's friend group, and a newly single Rita with her son. ==Cast==