Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Jack Liffey, Existentialist Gumshoe

Streets on Fire. What's all the controversy about? This is a great book that elevates the mystery genre. It challenges, provokes, and informs the reader. One will not find a better rendering of the contemporary L.A. landscape anywhere. The plot is well-known by now: Jack Liffey, existentialist gumshoe, sets out to find two missing college students against a backdrop of heightening racial tension. And he winds up in a wheelbarrow, where suspense and absurdity mix in equal parts. This book is inventive, funny, and socially redemptive. Any fan of mysteries, Los Angeles, and American history should not miss it.