One step forward, two steps back as Cannon hunts a mass murderer. Helping to cloud the facts: a police lab technician who's altering the evidence as quickly as it is found.
| Title | The Seventh Grave |
|---|---|
| Genres | Drama Action & Adventure |
| Release Date | 1973-02-28 |
| Episode Runtime | 01 Hours 00 Minutes |
| Season Number | 2 |
| Episode Number | 21 |
| Production Companies | Quinn Martin Productions (QM) |
