While walking along the banks of the River Thames, Watson finds a diamond tooth. The article takes on more meaning later, however, when Holmes learns that the body of a murder victim had been discovered near where Watson found the tooth.
| Name | Type | Role | |
|---|---|---|---|
| Pierre Gay | Guest Star | ||
| David Oxley | Guest Star | ||
| Sacha Pitoëff | Guest Star | ||
| Charles Brodie | Guest Star | ||
| Bob Cunningham | Guest Star |