Professor Soames has developed a sonic rifle, capable of projecting destructive waves of ultrasonic vibration, accurate to within a centimetre over thirty feet. But three unscrupulous saboteurs intend to use Soames' rifle to bring down an experimental aircraft, holding the Professor's daughter hostage to ensure his complicity. When Father Unwin becomes suspicious and investigates, he too is held prisoner in Soames' house.
| Title | The Secret Service - Season 1 Episode 9 The Deadly Whisper |
|---|---|
| Year | 1969 |
| Genre | Action & Adventure, Animation |
| Country | United Kingdom |
| Studio | Associated Television |
| Cast | Sylvia Anderson, Stanley Unwin, Keith Alexander, Gary Files, David Graham, David Healy |
| Crew | Reg Hill (Producer) |
| Alternative Titles | |
| Keyword | critical, disdainful |
| First Air Date | Sep 21, 1969 |
| Last Air date | Dec 14, 1969 |
| Season | 1 Season |
| Episode | 13 Episode |
| Runtime | 30:14 minutes |
| Quality | HD |
| IMDb: | 5.10/ 10 by 7.00 users |
| Popularity | 5.037 |
| Language | English, French |
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