Afflicted with a stammer, Prince Albert (Colin Firth), the Duke of York, dreads the speaking engagements that come with being the son of King George V (Michael Gambon). Under pressure from his wife Elizabeth (Helena Bonham Carter), Albert agrees to address the problem by visiting Australian speech therapist Lionel Logue (Geoffrey Rush).
Gifted with a typically Antipodean aversion to deference, the charismatic Logue treats his latest client like any other; provoking indignation from the Prince - until his unorthodox methods yield results.
Following the death of the King, Albert's feckless brother (Guy Pearce) takes to the throne as King Edward VIII. Mired in controversy over his relationship with American socialite Wallis Simpson (Eve Best) and an unlikely figure to lead Britain in its brewing troubles with Hitler's Germany, Edward's reign is expected to be brief.
As the Prince eventually falls out with his outspoken therapist, Edward does indeed step down, and Albert will need his old friend's unique skills as he becomes King George VI and addresses Britain during its darkest hour.