Marling Ceramics, run by Cathy's friends, Richard and Allan Marling, claim to be on the verge of creating an unbreakable china. However, when Steed arrives to investigate, a body is discovered in a tank of clay.
| Creator | Sydney Newman |
|---|---|
| Actor | Patrick Macnee, Linda Thorson, William Lucas |
| Country | United Kingdom |
| Production | Associated British Picture Corporation |