These are really enjoyable stories so far. They were described in the blurb I read as "an American Sherlock Holmes", but Craig Kennedy is much more about scientific techniques than deductive reasoning. His sidekick is a journalist, and is noticeably less bumbling than Dr. Watson, although he does tend to admire Kennedy's genius more than to contribute to it.

Although technically these are mysteries, they *feel* like good old-fashioned science fiction. They're set in an era when modern technology was just starting to make serious inroads into people's lives, so that gives it a slightly exotic air; and gives the science and technology a very futuristic feel for the time.