Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A very good book

I like this book. The character of Sherlock Holmes is one with whom the author is obviously well familiarised; Holmes' mannerisms and methods are well displayed. Arthur Conan Doyle would, I believe, approve. The concepts presented are well written and set before the reader in a most interesting way. The conversational nature in which each case is solved provides maximum clarity and renders otherwise difficult topics easily grasped. The only thing wrong with the book is that it at present has no sequel, at least none that I know of.