And think nothing more of it. The case is closed, Madeline is dead and we're free

Helen:
Now, listen to me, Ernest. I thought this thing through carefully and I know it's the only way. Tonight, while she's asleep, you'll sneak downstairs, quietly, go to the study, and take one of each kind of wine glass from the shelf. Then, you'll take this narcanal and lightly coat each glass. As you know, narcanal is a very powerful alcohol-based tranquilizer, so you won't need much. Tomorrow, I'll call Madeline to say goodbye. I'll try to get her to invite me to dinner. Madeline:
*In fantasy sequence* Fine, why don't you just come to dinner? Helen:
Then, at dinner, we propose a toast. No matter which glass she drinks from, the narcanal will be on the glass. Then, you and I work together quickly. First, we finish dinner. Then, we load her in the car, take her to the top of Mulholland Drive, call the police and report that we've seen a drunk woman swerving dangerously close to the edge. Ernest:
*In fantasy sequence* There's some drunk woman up here on Mulholland, swerving dangerously close to the edge. Helen:
We'll sit her up in the driver's seat and make it look like she's had just a little bit too much too drink. We drop the car into gear, wedge her foot down on the accelerator, clamp her hands on the steering wheel and send her on her way. By the time they perform the autopsy, the narcanal will be completely dissolved, leaving only traces of alcohol. She'll be classified as just... Fantasy Doctor #1:
*In Helen's voice during fantasy sequence*... another drunk driver. Helen:
They'll check her blood-alcohol. Fantasy Doctor #2:
.4-0. She had it coming. Helen:
And think nothing more of it. The case is closed, Madeline is dead and we're free