Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Twisted under the surface

Conrad's mastery of the English language lend the book a lyrical and rich quality. On cursory reading, the narrative appears naturalistic, almost normal, but below that surface lie many layers, each difficult to define, and each impossible to separate from the natural flow of the text. It is a metaphysical treatise on good and evil, a sharp damnation of the opportunism and speculation of colonialism, a brilliant rendering of impenetrable Africa, a picaresque, and a treasure map which points out the region of the heart, if not the exact spot, in which human compassion can be buried and hidden forever