Take another look at the sentence:
Wiping fingerprints off his eyeglasses with a paper towel, the book pages
were finally readable.
Wiping fingerprints off his eyeglasses with a paper towel, a participle phrase, comes right before book pages, an illogical target. People, not pages, can wipe eyeglasses with a paper towel! Before you continue, review the rules for misplaced and dangling modifiers.
Go back to the sentence to try again.