Which tense should you use when talking about a book if it is narrated in both the past and present tenses? I am asking this because in To Kill a Mockingbird (Can you underline book titles here?) Scout uses both the present and past tenses when narrating the story.
In your writing about a book, I think you should select either present tense or past tense and stick with it throughout your report. So, for example, you might say:
In this coming of age book, Scout finds that rumors have destroyed Boo Radley's reputation. OR, In this coming of age book, Scout found that rumors had destroyed Boo Radley's reputation.
We call this being parallel, or staying true to your writing's tense.