| Cast overview, first billed only: | |||
| Charles Bronson | ... | Deakin | |
| Ben Johnson | ... | Marshal Pearce | |
| Richard Crenna | ... | Gov. Richard Fairchild | |
| Jill Ireland | ... | Marica | |
| Charles Durning | ... | O'Brien | |
| Ed Lauter | ... | Maj. Claremont | |
| Bill McKinney | ... | Rev. Peabody | |
| David Huddleston | ... | Dr. Molyneux | |
| Roy Jenson | ... | Chris Banion | |
| Rayford Barnes | ... | Sgt. Bellew | |
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Scott Newman | ... | Rafferty |
| Robert Tessier | ... | Levi Calhoun | |
| Joe Kapp | ... | Henry | |
| Archie Moore | ... | Carlos | |
| Sally Kirkland | ... | Jane-Marie | |
After a sudden outbreak of diphtheria, the authorities dispatch an express train carrying reinforcement soldiers and medical supplies through the frozen West across the Rocky Mountains to aid the remote garrison of Fort Humboldt. Along with the troops, there are also aboard Governor Richard Fairchild; the outpost commander's daughter, Marica; the squad's captain, Major Claremont; the U.S. Marshal, Pearce, and his mysterious prisoner, John Deakin. Indeed, this was supposed to be a routine operation; however, before long, in this confined but well-guarded place, missing officers and unexplained deaths start to shroud the mission with mystery and suspicion, as an unstoppable unknown killer is picking them off one by one. Who is the murderer in their midst? Written by Nick Riganas
Alistair MacLean has always been one of my favorite authors, dating back to my high-school days in the mid-'60s. He has written many outstanding books, and many films have been made from them. Too many times, however, the title is the only thing that remains the same.
Not in this case, however. Either MacLean himself was involved with this film, or the director actually read the book first before starting, as this film is faithful to the book. A rarity indeed.