Instruct: Classify a review into positive or negative sentiment.
Query: A powerful tale of love and loss

Reading this book was an emotionally draining experience-the kind that always comes after reading a thrilling literary novel. Many of the characters in this book feel loss in one sense or another, but it's the way Crombie conveys this that make the book so potent. With magnificent characters and startling plot twists, this elaborate whodunit keeps you guessing up until the end. Even though I was disappointed by the identity of the killer, the book was still worth it. Superintendent Duncan Kincaid gets an unexpected call from his ex-wife, who is writing a biography of ill-fated poet. Asked to look into the poet's suicide, Duncan finds some inconsistencies but the police refuse to reopen the case. Suddenly his ex-wife is murdered; poisoned just like the poet. Now Duncan and his partner and lover, Sergeant Gemma James, must find out who murdered the poet in order to expose his ex-wife's killer.