A deaf mute schoolteacher runs to Don's apartment for protection from thugs after she lip-read a conversation they were having at a restaurant. She could make out only jumbled portions of it, but it was enough to make her a target for murder. Don stays at her side while Checkmate looks for her would-be assassins.
| Name | Type | Role | |
|---|---|---|---|
| Rik Vollaerts | Writer | ||
| Harold Clements | Writer | ||
| Allen Pinson | Guest Star | ||
| Ted Stanhope | Guest Star | ||
| Parley Baer | Guest Star | ||
| Percy Helton | Guest Star | ||
| Leonard Bremen | Guest Star | ||
| Ken Lynch | Guest Star | ||
| Mike Mahoney | Guest Star | ||
| Dennis Rush | Guest Star | ||
| Donna Douglas | Guest Star | ||
| Diana Lynn | Guest Star | ||
| Clegg Hoyt | Guest Star | ||
| Jeanne Bates | Guest Star | ||
| Paul Stewart | Director |