Who Killed Cock Robin?

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.