Jim Donaldson does a great job with the narration of "Frankenstein." Every character has its own distinctive voice (with the exception of the namesake doctor, whose voice changes when the point of view shifts from third- to first-person and back). My only wish would have been that they had hired a female to read Mary Shelley's introduction.
Please note that there are four "doubled-up" lines in this performance that should have been caught during editing, which gives the impression that the Audible player "skipped." No skipping...just a couple of line re-reads. Almost all of them are near the beginning, and one is about three-quarters of the way through, so they're needle-in-a-haystack things at best.