This is NOT the Sherlock Holmes of Sir Arthur Conan Doyle. He's not completely human--a race of shadowy super-aliens made him and sprung him, full grown, upon the world. He's not Always Rght. Rather than being able to deduce ANYTHING, this Holmes sometimes has to guess. He doesn't work with Scocland Yard (yet), he goes it alone--and he sometimes has to do something that Doyle's Holmes never, never did: trust his luck in order to survive.
Simon Jones, whose eyes the stories are seen through, is, likewise, no John Watson. Watson was a Medical Doctor and a soldier, and still found a way to write memoirs that put many a professional writer to shame. Simon is a Comuter Technical Support Representative--and he makes it seem like it's one step above flipping burgers at a fast food joint (TSR's are generally college graduates--they have above-average minds and skills that some people never get).
As if in answer to this critique, in "The Doomsday Key," Holmes himself berates Simon for "dumbing down" the story.
For all his faults, he's a credible Holmes--still capable of building a profile of a passerby at a glance and smart enough to think two or three moves ahead. He's also quite a bit more of a swashbuckler than Doyle's character. There's quite a bit of Doctor Who in him--even the venusian form of Martial Arts he uses is a hats-off to one of the most enduring TV characters of all time. And Simon seems to muddle by. He even saved the world on at least one occasion. You won't turn your nose up at them--they'll keep you interested.
Rather than going thick on details, author Adrian Sherlock has chosen to keep the story moving from one world and one time to another. The stories are quick-paced and imaginative. You can forgive Sherlock for whatever oversights he may have, because, despite it all, he does a good job of bringing to life Sherlock Holmes, Simon Jones and a supporting cast with a sense of fun. He is also VERY good at keeping the story moving. Even when I snickered at some of the lines, I thoroughly enjoyed the way they would be through that part and on to another before there was a chance for it to get old.
In short, this is very good Young Adult fiction. It's not heavy on the mind or thick on the details. You can read it without knowing a thing about other takes on Holmes or about Conan Doyle, and still end up glad that We of Earth has a protector of this caliber working on our behalf. If you liked Harry Potter or Doctor Who, you'll like Sherlock Holmes: Time Detective.