Unbalanced widow Amy Cameron, Barnaby's niece, is suspected to have shot Clark Harrison, but cannot remember. After Amy's attempted suicide Barnaby analyzes her blood and finds traces of a hypnotic drug, producing black-outs. He uncovers a scheme involving Amy's house keeper Mary.
| Name | Type | Role | |
|---|---|---|---|
| Dick Nelson (I) | Writer | ||
| Don Diamond | Guest Star | ||
| Regis Cordic | Guest Star | ||
| Howard Culver | Guest Star | ||
| Nancy Conrad | Guest Star | ||
| Lynn Carlin | Guest Star | ||
| Saundra Sharp | Guest Star | ||
| Julie Sommars | Guest Star | ||
| Richard Doyle | Guest Star | ||
| William Kirby Cullen | Guest Star | ||
| Dennis Donnelly | Director |