Holmes and Watson are called to a boy's school in Belgium. It seems that a young student has gotten into the habit of writing the names of faculty members on the steps of a nearby church, and shortly afterwards person whose name has been written down is found dead.
| Name | Type | Role | |
|---|---|---|---|
| Gertrude Fass | Writer | ||
| George Fass | Writer | ||
| Héléna Manson | Guest Star | ||
| Robert Le Béal | Guest Star | ||
| Jacques François | Guest Star | ||
| Nicole Courcel | Guest Star | ||
| Yves Brainville | Guest Star | ||
| Maurice Teynac | Guest Star | ||
| Sheldon Reynolds | Director |