Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sherlock Holmes fans, beware

As others have noted, this book starts very well, with Vanneman offering a reasonable imitation of Doyle. But once Holmes and Watson leave England, the book takes a sharp turn for the worse. Watson goes on a long sea voyage, with Vanneman seemingly describing each league along the way. He has sex with four different women, a most un-Doyle idea. Holmes is off stage far too long, thinly-written other characters intrude, and finally the reader's patience wears out altogether. There have been several pastiches based on Doyle's mention of Holmes involvement in a case centering on a giant rat of Sumatra, and few have been good. This is the worst yet.