[fantasyfan]

I finished listening to Sapphire & Steel: The Surest Poison. It's episode 2 in the second series by Big Finish. The main voice actors are David Warner and Susannah Harker.

This particular episode didn't have the freezing horror of some of the quite terrifying episodes in the first series--Daisy Chain being an especial example. I found this one used a clever well-developed time travel theme with the usual play on temporal paradox. It had something of the quality one finds in Doctor Who--though with a touch of horror than one seldom experiences in the latter.

While not as disturbing as the stories in the first series, it was interesting and explored some psychological states reasonably well.