Dr. Keel saves a dancing instructor from dying from gas asphyxiation. The woman is later discovered strangled with Keel's scarf and he is framed for the murder. Steed suspects the pianist at the woman's dancing school who is accused of numerous murders to be responsible. The killer's trademark is to kill his victims by tossing a radio into the bathtub and electrocuting them. 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.
Production for the episode was completed on 13 April 1961.[3]
Stabbing incident
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. He was ordered to spend twelve months of this sentence as a patient at London's St Luke's Hospital.[6]
