Whoever Heard of a Ghost Dying?

A villain called Hellingworth uses medium Cecil Purley to prove that Marty is indeed a ghost and, posing as an insurance salesman, approaches Jeff for alleged help with robberies in the knowledge that Marty will eavesdrop on the gang and report back to Jeff. This happens but Marty is being used purely as a decoy whilst the gang rob other venues. Eventually Hellingworth decides to get rid of Marty and calls Purley in to exorcise him. For once it is Jeff rushing against time to save Marty rather than the reverse.