Colonel March receives a plea from a model for help, the following day she's found dead.
This is such an imaginative story, it's well thought out, fast paced, and generally satisfying to watch. What's nice about this episode, is how much Colonel March is present, he's been a bit player in the few I've watched, he's very central here.
The main reason for watching this, is for the cast, Boris Karloff and Christopher Lee, and it's not a horror, the pair are fantastic, the charisma is there in abundance.
You also get Fanny Rowe, known for Fresh Fields and After Henry, and the velvet voiced Peter Dyneley, famous I would argue as one of the voices behind Thunderbirds.
It's a very enjoyable short mystery. 8/10.