Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An engrossing, enjoyable read, with many interesting ideas

Although the "forward into the past" concept isn't new, Stirling has managed to make it seem that way. The problems are realistic, the characters interesting (a couple a bit *too* interesting...) and the plot development enjoyable and full of interesting surprises. There's a lot going on, but he never loses the narrative thread despite scene-jumps. Buy it! P.S. This would make a great movie. Anyone from Hollywood listening? Harrison Ford as Jared Cofflin! Angela Bassett as Marian Alston....