As she did in "The Passion", Winterson displays her gift for punching the reader in the face, then kicking you in the heart, and you still come out of the experience saying, "Can someone read this to me, out loud?"
It's a critique of the modern world, a critique of the future (extrapolated from the modern world), a re-vamped look at the past, and then another critique of the future. Seriously.
Oh... also...? It's fantastic. Bleak, beautiful, poignant, hopeless, hopeful... and definitely not for the faint of heart.