Sebastian is an undisciplined mathematics genius who works in the "cipher bureau" of the British Intelligence. While cracking enemy codes, Sebastian finds time to romance co-worker Rebecca Howard.

Top Cast

Dirk BogardeSebastian

Susannah YorkRebecca Howard

Lilli PalmerElsa Shahn

John GielgudHead of Intelligence

Janet MunroCarol Fancy

Ronald FraserToby

Margaret JohnstonMiss Elliott

Nigel DavenportGen. Phillips