Bird lover Mrs. Wentworth Howe left her estate in trust, stipulating in her will that the money would not be distributed among any relatives as long as a bird remained alive in the aviary at the Howe mansion. When one of the birds is shot dead, estate trust attorney Laverick hires Jeff to investigate. When Jeff shows up at the mansion, the list of possible suspects grows shorter and shorter as the relatives are murdered one by one. (thetvdb.com)