Drake poses as a put-upon schoolteacher to win the confidence of a suspected spy.
| Name | Type | Role | |
|---|---|---|---|
| Philip Broadley | Writer | ||
| Anthony Dawson | Guest Star | ||
| Raymond Adamson | Guest Star | ||
| Wendy Richard | Guest Star | ||
| Edward Chapman | Guest Star | ||
| John Fraser | Guest Star | ||
| Edward Cast | Guest Star | ||
| Sheila Mathews | Guest Star | ||
| Michael Truman | Director |