"The Purgatorio, the middle section of Dante's great poem about losing, and subsequently finding, one's way in the middle of one's life is, unsurprisingly, the beating heart of the Divine Comedy, as this powerful and lucid new translation by the poet D. M. Black makes wonderfully clear. After days spent plumbing the depths of hell, the pilgrim staggers back to the clear light of day in a state of shock, the sense of pervasive dread and deep bewilderment...