Mildred and Agatha are named in a will. Heirs start dying, and next to inherit is Agatha, whose investigation runs parallel to McMillan's.
| Name | Type | Role | |
|---|---|---|---|
| Virginia Aldridge | Writer | ||
| James Whitmore Jr. | Guest Star | ||
| Janette Lane Bradbury | Guest Star | ||
| Tab Hunter | Guest Star | ||
| Nancy Malone | Guest Star | ||
| Slim Pickens | Guest Star | ||
| Don 'Red' Barry | Guest Star | ||
| Gordon Jump | Guest Star | ||
| Alejandro Rey | Guest Star | ||
| Bob Finkel | Director |