List of episodes and broadcast dates
Episode one (15 January 1966)
Episode two (22 January 1966)
Episode three (29 January 1966)
After the switch of identity. Sutton has been seized by The Ring. And Sanders, with the murder of Austin, has taken his first step towards the twenty-five-million dollars that lie hidden somewhere in London. (Radio Times, 27 January 1966, p.7.)
Episode four (5 February 1966)
The hunt for Sanders is on, and Sutton has escaped from The Ring. But now Sutton has to penetrate beyond the Benton Bureau to track down the elusive Mr. Smith and Mr. Brown. (Radio Times, 3 February 1966, p.7.)
Episode five (12 February 1966)
The search for The Ring's $25 million has widened to include Cherverski and Melitza. But who was waiting at Cranberry Mansions to trap Gregor Sanders? (Radio Times, 10 February 1966, p.7.)
Episode six (19 February 1966)
The race for the treasure is on. But Janning is dead and the vault still unopened–and Stern and his men are still at large. (Radio Times, 17 February 1966, p.7.)
