Build a movie plot around this: What is hidden in the chandelier? A huge diamond
A fake psychic, Blanche Tyler (Barbara Harris), and her boyfriend, George Lumley (Bruce Dern), attempt to locate the nephew of a wealthy and guilt-ridden elderly woman, Julia Rainbird (Cathleen Nesbitt). Julia's deceased sister gave the baby boy up for adoption, but Julia now wants to make him her heir, and will pay Blanche $10,000 if the man, Edward Shoebridge, can be found. George Lumley discovers that Shoebridge is thought to be dead, but he tracks down another criminal, Joseph Maloney (Ed Lauter), who paid for the tombstone over an empty grave.Shoebridge murdered his adoptive parents, faked his own death and is now a successful jeweler in San Francisco known as Arthur Adamson (William Devane). He and his live-in girlfriend, Fran (Karen Black), kidnap millionaires and dignitaries, returning them in exchange for ransoms in the form of valuable gemstones. Arthur conceals an enormous diamond in plain sight in their crystal chandelier.Arthur enlists Maloney, who had helped murder his adoptive parents, to kill Blanche and George. Maloney initially refuses to help, but then contacts Blanche and George, telling them to meet him at a cafe atop a mountain. He cuts the brake line of Blanche's car, but the couple manage to survive a dangerous high-speed descent. Maloney then tries to run them over, but dies in a fiery explosion when he swerves to avoid an oncoming car and tumbles down the mountain.At Maloney's funeral, his mother (Katherine Helmond) tearfully confesses to George that Shoebridge's name is now Arthur Adamson. George has to go to work, so Blanche tracks down various A. Adamsons in San Francisco, eventually reaching the jewelry store as it closes for the day. Arthur's assistant Mrs. Clay (Edith Atwater) offers to let Blanche leave a note, but Blanche says she is Arthur's friend and asks for his address.Arthur and Fran are bundling a kidnapped Bishop Wood (William Prince), into their car when Blanche rings their doorbell. They attempt to drive out of their garage, but Blanche's car is blocking their...