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Title: Good beginning, sliding fast.
Review: Charles Pike's review has it right: "Timeline" starts out well, but after catching the reader's interest, it takes some seriously wrong turns. Once the scientists have moved into the medieval past, the book becomes a kind of all-text video game in which they must confront one crisis after another, in a tedious and predictable series of battles. I felt that I was trudging to the end, determined to finish though it was a waste of time. (I just wondered if Crichton might have created a video game first and then written the book.)
