Instruct: Classify a given review into positive or negative sentiment.
Query: Absorbing, unforgettable murder mystery.

This is a beautifully written book that I couldn't put down. Reading it is like watching a movie: you get swept along and totally absorbed. Escapist literature to the Nth degree. Open the cover and you're transported out of your world. Fascinating juxtaposition of wilderness vs. inner city. The details ring true.