Drake travels to Hong Kong to investigate the murder of a sound technician working for a radio station. He uncovers a plot where the secret information is being sent out in code over the air, transmitted as part of the station's English lessons.
| Name | Type | Role | |
|---|---|---|---|
| Marc Brandel | Writer | ||
| Burt Kwouk | Guest Star | ||
| Julie Allan | Guest Star | ||
| Sam Chowdhary | Guest Star | ||
| Patsy Rowlands | Guest Star | ||
| Chin-Yu | Guest Star | ||
| Andy Ho | Guest Star | ||
| So0Bee Lee | Guest Star | ||
| Ric Young | Guest Star | Mr. Toy (as Eric Young) | |
| Rupert Davies | Guest Star | ||
| Gary Cockrell | Guest Star | ||
| Michael Truman | Director |