Great book. Suspenseful and humourous. Narrated by an omnicient point of view rather than Watson's.

One of Doyle's best short stories. It has a humourous streak in it.

Nice book by Arthur Conan Doyle. Very intresting and fast paced. Ideal for all.

Great book. Very short and full of suspense.

Good book, but a bit boring.
Great idea by H. B. Piper but not really properly prepared.
I give it (or rather, him) 3.5 stars.

Good book. Personally speaking, the book might do for a young audience, say, 8-11 years. More of a Fantasy than Science Fiction.

Great book! I couldn't put it down! Nice story for a beginner.

A great book!