A young RAF pilot tests his father-in-law’s prototype supersonic aircraft to the limit, at a time of intense development in the field of aviation, just as commercial jet airliners are about to enter service.

Ralph Richardson
as John Ridgefield

Ann Todd
as Susan Garthwaite

Nigel Patrick
as Tony Garthwaite

John Justin
as Philip Peel

Dinah Sheridan
as Jess Peel

Joseph Tomelty
as Will

Denholm Elliott
as Christopher Ridgefield

Jack Allen
as 'Windy'

Ralph Michael
as Fletcher

Leslie Phillips
as Controller
CinemaSerf
“JR” (Sir Ralph Richardson) is a magnate determined to develop an aircraft that can break the speed of sound. This is no mean feat, and with the man becoming all but obsessed with this breakthrough, he engages “Tony” (Nigel Patrick) who just happens to be married to his daughter “Susan” (Ann Todd) t...