Night Gallery (1970)

S2E16 Lindemann's Catch / The Late Mr. Peddington / A Feast of Blood

A mermaid held captive stirs unexpected feelings in a ruthless sea captain, who frantically looks for ways to ensure her survival. Meanwhile, a practical widow is on a mission to find the most affordable funeral options for her late husband. In a twisted turn of events, a detestable suitor levels the playing field against a cunning beauty by gifting her an eerie brooch that appears to have a life of its own.