During a Marathon Group Therapy weekend Ken Scanlan talks about his unfaithful wife Ruth. Lorraine, with whom he had a brief affair, slays Ruth to help Ken. As Ruth's life insurance policy had a double-indemnity clause, Barnaby and J.R. investigate hoping to stop any further murders.
| Name | Type | Role | |
|---|---|---|---|
| Worley Thorne | Writer | ||
| Alex Henteloff | Guest Star | ||
| Gina Alvarado | Guest Star | ||
| Mary Jackson | Guest Star | ||
| Sean Morgan | Guest Star | ||
| Anne Newman-Mantee | Guest Star | ||
| Lynne Marta | Guest Star | ||
| Robert Hogan | Guest Star | ||
| Laurie Jefferson | Guest Star | ||
| Paul Mantee | Guest Star | ||
| Lynette Mettey | Guest Star | ||
| Sudie Bond | Guest Star | ||
| Walter Grauman | Director |