In Poe's book "The Philosophy of Composition," he explicitly states that the sole province of the poem is the creation of the effect of beauty. The question is, naturally, "What is Beauty?" It is my opinon that Beauty would naturally be the main hook of the poem - or of any similar literary work. Or, perhaps, the opposite side of the Beauty not mentioned (creating a duality, tension, and hopefully release - but that's a different topic!) These considerations have lead me, with a bit of study of psychoanalysis, Fruedian and Jungian, that the only real Beauty worth mentioning is that asscociated, metaphorically or otherwise, with a person's ideal lover. As a matter of fact, Poe himself said something along the same lines. The meter must be as the heartbeat of the passion as such as one in the presence of the object of passion. The rime and diction must be relative to a person's idea of ego and non-ego.... by that mean how we (cognitively) express interest in our love. But the essential point is that this Beauty - lover - need not be another person. Perhaps it's the drug of choice, the reader's archtypical god, a fixation (heathy or not), a first girl/boyfriend... I hope that you get the idea... So the question is, how do you define the "hook" of a literary work? Is there one at all?