These are 2 episodes first of which was broadcast on 11th March 1974 on the radio called - Sergeant Wilson's Little Secret. The second episode was first broadcast on 15th April 1974 called Something Nasty in the Vault.
It was meant to be a harmless stag night prank. A few hours later four of his best friends are dead and Michael Harrison has disappeared. With only three days to the wedding, Detective Superintendent Grace - a man haunted by the shadow of his own missing wife - is contacted by Michael's beautiful, distraught fiancée, Ashley Harper. Grace discovers that the one man who ought to know Michael Harrison's whereabouts...