After his aircraft company's groundbreaking work on jet engine technology in the Second World War, John Ridgefield (Ralph Richardson), its wealthy owner, employs test pilot Tony Garthwaite (Nigel Patrick), a successful wartime fighter pilot, to fly new jet-powered aircraft. Garthwaite is hired by Ridgefield after marrying Ridgefield's daughter, Susan (Ann Todd). Tensions between father and daughter are accentuated by Garthwaite's dangerous job of test flying. In a noteworthy illustration of the new technology, Susan accompanies Garthwaite on a ferrying assignment of a two-seater de Havilland Vampire to Cairo, Egypt, returning later the same day as passengers on a de Havilland Comet.

Ridgefield's plan for his new jet fighter, "Prometheus", has placed the company in jeopardy. The problems faced by the new jet aircraft in encountering the speed of sound, the so-called "sound barrier", are ever present. In an attempt to break the sound barrier, Garthwaite crashes and is killed.

Shocked at both the death of her husband and at her father's apparently single-minded and heartless approach to the dangers his test pilots face, Susan walks out on her father and goes to live with friends Jess (Dinah Sheridan) and Philip Peel (John Justin), another company test pilot. Ridgefield later engages Peel to take on the challenge of piloting "Prometheus" at speeds approaching the speed of sound. In a crucial flight and at the critical moment, Peel performs a counterintuitive action (foreshadowed in the opening scene of the film) which enables him to maintain control of the aircraft and to break the sound barrier. Eventually accepting that her father did care about those whose lives were lost in tests, Susan changes her plan of moving to London and takes her young son with her back to live with Sir John.
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== osoby ==			== profese ==
	Terence Rattigan		Scénarista
	David Lean		Producent

== osoby ==	== postava ==
Ralph Richardson	John Ridgefield
Nigel Patrick	Tony Garthwaite
Ann Todd	Susan Garthwaiteová

cena	festival	ročník	osoba	nominace/cena
Nejlepší Mix zvuku	Oscar (Cena Akademie)	25 (1952)		cena
Nejlepší herec	New York Film Critics Circle Awards	18 (1952)	Ralph Richardson	cena
Nejlepší film z libovolného zdroje	BAFTA	6 (1952)	David Lean	cena
Nejlepší britský herec	BAFTA	6 (1952)	Ralph Richardson	cena
Nejlepší britský film	BAFTA	6 (1952)	David Lean	cena
Nejlepší pùvodní scénář	Oscar (Cena Akademie)	25 (1952)	Terence Rattigan	nominace
Nejlepší film	New York Film Critics Circle Awards	18 (1952)	David Lean	nominace
Nejlepší britský herec	BAFTA	6 (1952)	Nigel Patrick	nominace
Nejlepší britská herečka	BAFTA	6 (1952)	Ann Todd	nominace