Wealthy industrialist Frederick Haley, who has been appointed to an important position at a humanitarian foundation, asks Checkmate to find out who has been threatening his mistress, whom he plans to marry after leaving his wife.
| Name | Type | Role | |
|---|---|---|---|
| Mark Rodgers | Writer | ||
| William Allyn | Guest Star | ||
| Barry Brooks | Guest Star | ||
| Lucille Curtis | Guest Star | ||
| Peter Helm | Guest Star | ||
| Bart Patton | Guest Star | ||
| Maxine Stuart | Guest Star | ||
| Ben Pollock | Guest Star | ||
| Kathleen Crowley | Guest Star | ||
| Robert Gallagher | Guest Star | ||
| Macdonald Carey | Guest Star | ||
| Russ Grieve | Guest Star | ||
| Faye Michael Nuell | Guest Star | ||
| William A. Graham | Director |