This is the true story of Christy Brown (Daniel Day-Lewis), who was born with cerebral palsy (CP) into a poor Irish family in 1932 and overcame severe physical disability to become a famous artist and writer. In his early years Christy is severely disabled and disfigured--spastic, unable to speak, and close to quadriplegic, able to control only his left foot. His father (Ray McAnally) initially regards him as both retarded and sinful, but his mother (Brenda Fricker) faithfully and heroically cares for him.

Gradually, as he begins to speak, Christy's intelligence becomes apparent, his father accepts him into the family, and he trains himself to paint with his left foot. In his Dublin neighborhood, Christy is widely accepted, playing football goalie (by lying across the goal) and being made King of the Bonfire on All Hallows Eve, and he at least passively participates in an adolescent game of spin-the-bottle.

CP specialist Dr. Eileen Cole (Fiona Shaw) recognizes Christy's artistic talent and offers to train him. She brings him Shakespeare's "To be or not to be" soliloquy, gives him training in speech and movement control, and arranges for a one-man show of his artistic work. Christy falls in love with Dr. Cole and is crushed when she reveals that she is already engaged, and he tries unsuccessfully to slit his wrists.

Recovering emotionally from that disappointment, Christy in the years that follow sees more success as an artist and writes the autobiography on which this film is based--and, we are told in a closing title, he marries his nurse when he is about 40. (Christy Brown died in 1981 in his late forties.)