Summaries of the narratives (plots) of works of fiction are conventionally presented using the present tense rather than the past tense. At any particular point of the story, as it unfolds, there is a now, and hence a past and a future, so whether some event mentioned in the story is past, present, or, future changes as the story progresses; the entire plot description is presented as if the story's now is a continuous present. Thus, in summarizing the plot of A Tale of Two Cities, one may write:
"Manette is obsessed with making shoes, a trade he learned while in prison.