context: The story involves a fake psychic, Blanche Tyler (Barbara Harris), and her con-artist, taxi driver boyfriend, George Lumley (Bruce Dern), who attempt to locate the nephew of a wealthy and guilt-ridden old woman, named Julia Rainbird (Cathleen Nesbitt). Julia, one of Blanche's clients, was responsible for her now-deceased sister giving up a baby boy for adoption years earlier and now wants to make him her heir. She will pay Blanche $10,000 if he is found.However, the nephew and prospective heir is now a successful jeweler in San Francisco known as Arthur Adamson (Williams Devane), who has a secret and lurid past, having apparently murdered his adoptive parents and faked his own death. With his girlfriend Fran (Karen Black), he has successfully kidnapped an assortment of millionaires and dignitaries, returning them when the ransom, a valuable gemstone, has been delivered, which they hide in their chandelier.Eventually the paths of these two couples cross when Adamson learns that Blanche and George are pursuing him, and he suspects the worst, putting their lives in danger. It begins to come together when George begins looking up the missing nephew by going to the local records office to find the adoptive parents that Julia's sister gave her baby to.(In the birth and death records office, the audience can see the silhouetted shadow of the director of the film, Alfred Hitchcock, in one of his renowned cameos.)George learns that the real name of the nephew was Edward Shoebridge and he follows the leads to a gas station owner named Moloney (Ed Lauter) who helped Adamson fake his death and covered it up. Moloney then meets with Adamson who tells him about George asking questions about 'Edward Shoebridge' in which Adamson and Fran begin staking out George's house and follow him to Blanche's house where they overhear him talking about the Shoebridge leads and that Moloney knows more then he is saying.Adamson then sends Moloney to kill both Blanche and George by pretending that he knows information about the missing nephew and agrees to meet at a remote restaurant in the mountains. Moloney attempts to sabotage the brakes on George and Blanche's car while they wait at the restaurant for Moloney to show up. When he doesn't, they leave and find themselves trapped in their car as it skids down the sloping mountain road. But they manage to survive. Failing this, Moloney attemps to run them down on the road, only to have his own car go over a cliff and crash... killing him.George learns from Moloney's wife about his part in the Edward Shoebridge murder/cover up and learns the alias of Arthur Adamson. While George has to take a shift at driving his taxi, Blanche decides to look for Adamson on her own. Finally tracking down Adamson to the jewelry store which he owns, she goes over to his house where he and Fran are in the process of delivering back another kidnap victim, a wealthy Catholic bishop named Wood (William Prince), when they are about to pick up their latest ransom.Adamson and Fran trap Blanche in the basement garage of their house when she comes to tell them the good news about the Rainbird inheritance. Seeing that Adamson is a criminal responsible for the kidnappings in the area, Blanche attempts to flee, but they capture her and drug her, and lock her in their secret room in the basement where they keep their captives.A little later, George, learning about Blanche's discovery, heads over to the Adamson's house and after finding nobody home, he notices Blanche's car outside. George sneaks into the house through a basement window. When Adamson and Fran return after collecting another diamond for this latest Bishop Wood ransom, George hides and follows them down into the basement's secret room where he overhears them plotting to kill Blanche. George and Blanche manage to turn the tables on the other couple and succeed in locking them in their own secret room.Afterwards, Blanche is elated when she thinks about how much the reward will be for catching these thieves, until George points out how much more it will be if they could also locate the stolen diamonds. Suddenly, Blanche seems to go into a trance and makes her way to the crystal chandelier on which the diamonds are hanging. George congratulates Blanche for really being a psychic. As George picks up a phone to call the police, Blanche smiles and winks at the camera.
question: After drugging her, where did Arthur leave Blanche while he and Fran leave to collect ransom for the bishop?
answer: Basement