Take a photo of a barcode or cover
A decent but not outstanding entry in the series, marred only slightly by having seen the film before reading the book - though I'd forgotten enough, and there are a few deviations, to save it from being a real problem. Not Reacher's best, but like all of them thus far (I"m stubbornly reading them in order - yes, I know it's not necessary), it's solidly entertaining.