Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Creepy blend of spooky psycho-thriller and whodunit.

The author writes knowledgeably and well. She knows how to weave a complicated tale. She is a good mystery writer and has evidently done her homework. She knows her craft. (I'm a writer myself and that's important to me.) I recommend it highly as plain old good entertainment.