|James Stewart||Theodore Honey|
|Marlene Dietrich||Monica Teasdale|
|Glynis Johns||Marjorie Corder|
|Jack Hawkins||Dennis Scott|
|Elizabeth Allan||Shirley Scott|
|Janette Scott||Elspeth Honey|
|Ronald Squire||Sir John|
Theodore Honey is a mathematician charged with discovering what caused the crash of a ''Reindeer'' airliner. As he travels to investigate, he realizes en route that he's flying on the very same type of airplane. Convinced it will suffer a similar accident, he deliberately sabotages it once it lands, and soon finds himself defending his sanity in an English courtroom. Fortunately, a sympathetic actress and a stewardess come to his defense.