Suki is writing an essay comparing another gothic text to this excerpt from The Strange Case of Dr. Jekyll and Mr. Hyde.

On his way out, the lawyer stopped and had a word or two with Poole. "By the bye,” said he, "there was a letter handed in to-day: what was the messenger like?” But Poole was positive nothing had come except by post; "and only circulars by that,” he added.

If her other gothic text contains the same gothic literature elements that appear in this excerpt, what should she focus on to draw a comparison?

a horrific event
a mysterious event
a supernatural event
an amusing event