A six-part spy thriller set in Russia.
For detailed, episode-by-episode synopses, see below.
List of episodes (via the Radio Times):
Episode one: Curtains for Otto (broadcast 10 September 1965)
Episode two: Mission to Moscow (broadcast 17 September 1965)
Agent X09 is sent to Moscow on an assignment and is slightly diffident because he is told that his boss will be a woman, Agent X34. (Radio Times, 9 September 1965, p.57)
Episode three: The Microdot Blouse (broadcast on 24 September 1965)
A search for the mysterious woman whom it is thought may possess the microdot blouse ... (Radio Times, 16 September 1965, p.65)
Episode four: Assignment in Leningrad (broadcast on 1 October 1965)
There is a surprise in store for Agent X09 when he finally locates the woman who is in possession of the microdot blouse. (Radio Times, 23 September 1965, p.61)
Episode five: Guest of the KGB (broadcast on 8 October 1965)
Agent X09 fails into a trap, and gets involved with the Russian Secret Police. (Radio Times, 30 September 1965, p.71)
Episode six: The Way Back (broadcast on 15 October 1965)
A double agent is discovered and Agent X09 completes his assignment in Moscow. (Radio Times, 7 October 1965, p.75)
Aired on the BBC (Light Programme) between 10 September and 15 October 1965.
Produced by Bill Gates.
Primary cast members included Robin Hunter (Michael Slade / X09), June Tobin (Anna Weston), Laurel Mather (Miss Plant), and Malcolm Hayes (The Chief).