Characterization - Montresor explains how he has acted toward his enemy
I am assuming that you are asking about Mr. Frank. He finds the secret room when he returns at the end of the war.
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If an essay is order Chronologically, then it is more or less like steps. So we would want a(n) transitional phrase that sounds like it could fit into a step process. That would be "Afterward," This phrase is most likely to show up in a chronological essay than the others. If you look at the others they are all shadowing further elaboration on something.
The answer is afterward
