Detective Ellery Queen has to solve a series of murders where the victims were killed in numerically descending ages, the male victims were strangled with blue cords and the female victims with pink ones.
| Directing | Barry Shear | Director |
| Writing | Frederic Dannay | Novel |
| Writing | Manfred Lee | Novel |
| Writing | Ted Leighton | Teleplay |
| Writing | Richard Levinson | Writer |
| Writing | William Link | Writer |
| Production | Leonard J. Ackerman | Producer |
| Production | Edward Montagne | Executive Producer |
| Sound | Jerry Fielding | Original Music Composer |
| Camera | William Margulies | Director of Photography |
| Editing | Sam E. Waxman | Editor |
| Art | Alexander A. Mayer | Art Direction |
| Art | Robert C. Bradfield | Set Decoration |
