Ghost hunter James McAllister asks for Jeff's help, having been hired by wealthy American Kim Wentworth to see if her home, Crake Castle, is haunted. McAllister is killed and it looks as if Kim's husband is the murderer, trying to frighten Kim away so that he can marry girlfriend Laura but it would seem that the butler did it and the butler and Kim are the killers, anxious to run off together. Jeff is their prisoner but fortunately Marty has found a local lady who can see and hear him - in order for him to effect a rescue.

Mr. Laverick, a solicitor, approaches Jeff with a bizarre assignment - to act as minder to an aviary of birds belonging to the late, eccentric Mrs. Wentworth Howe. Her will stipulates that her relatives will get a share of her large fortune only if the birds are all dead - and someone does kill one of the birds. However it is the relatives who are dying like flies and soon only one, Sandra, is left - making her the chief suspect. The murderer, however, turns out to be outside of the family but his efforts to kill the birds only end in his own destruction - with a little help from Marty.