On her 21th birthday Allison Clark gets an emerald necklace, that is stolen. Barnaby investigates for the insurance company. The accomplice of the thief is Kathy Cooper, Allison's friend from the Riding Academy, who romances Alison's wealthy widowed father.
| Name | Type | Role | |
|---|---|---|---|
| Robert W. Lenski | Writer | ||
| Robert Gibbons | Guest Star | ||
| Patrick Culliton | Guest Star | ||
| Don Knight | Guest Star | ||
| Stephen Parr | Guest Star | ||
| Bryan Montgomery | Guest Star | ||
| Lee Purcell | Guest Star | ||
| Bonnie Ebsen | Guest Star | ||
| Eddie Firestone | Guest Star | ||
| Dabney Coleman | Guest Star | ||
| Robert Doyle | Guest Star | ||
| Joel Stedman | Guest Star | ||
| Renne Jarrett | Guest Star | ||
| Walter Grauman | Director |