During the Vietnam War U.S. decoder Kate Meredith is plagued with guilt when her husband coerces her to pass information to him and the Viet Cong.
| Actor | Role |
|---|---|
 Joseph CottenColonel Woodward | Colonel Woodward |
 Martha HyerKate Meredith | Kate Meredith |
 Peter CushingJohn Meredith | John Meredith |
 John RonaneCapt. Elliott Thomas | Capt. Elliott Thomas |
 David SpenserInspector Sung | Inspector Sung |
 Alec MangoDucrai | Ducrai |
 Walter BrownMajor Matthews | Major Matthews |
| KKim SmithAllan Meredith | Allan Meredith |
 Burnell TuckerLawrence | Lawrence |
 Edwina CarrollKia | Kia |
| PPaula Li ShiuFlower Girl | Flower Girl |
| KKeith BonnardRooftop Assassin | Rooftop Assassin |
| LLee PetersNot listed | Not listed |
 Carol ClevelandGirl | Girl |