A Case of Spirits Cribb : Season 1 Episode 8

Two robberies at the homes of patrons of a medium holding séances in their houses seem rather more than coincidence but Jowett belongs to a group investigating the honesty of the medium, who is wired electrically to a bell which will ring if he moves in such a way that suggests trickery. Unfortunately the wiring explodes and he is killed. Cribb is called to investigate a death that was certainly not perpetrated by somebody from the spirit world.