The episode was directed by Don Leaver, designed by James Goddard, and written by Peter Ling and Sheilah Ward.
Keel is vindicated by Steed and arrives in the nick of time to stop the killer who has married a young woman and is about to murder her and steal her large cache of diamonds.
[3] On 11 April 1961 ABC (Iris Productions) producer and director Dennis Vance - who had directed the previous Avengers episode "Please Don't Feed the Animals" - stabbed his colleague Janice Willett in the shoulder during filming for the episode at ABC's Teddington Studios.
[4] Vance, who had experienced a mental breakdown the previous year, was charged with grievous bodily harm later the same day after giving himself up to police.
[5] At his subsequent trial, held at the Old Bailey on 27 April, Vance was found guilty due to diminished responsibility and sentenced to three years' probation.