Which line is most likely in the climax of the story?

The court was very cool and a little damp, and full of premature twilight, although the sky, high up overhead, was still bright with sunset.
Mr. Utterson was sitting by his fireside one evening after dinner, when he was surprised to receive a visit from Poole.
“Ah, that’s not Jekyll’s voice—it’s Hyde’s!” cried Utterson. “Down with the door, Poole!”
Utterson . . . trudged back to his office to read the two narratives in which this mystery was now to be explained.