Instruct: Classify the given review into positive or negative sentiment.
Query: What a disappointment!

After "The Time Ships" and "Ring," I couldn't wait to read "Titan." And Stephen Baxter's new book sure gets off to a great start. I turned 50 this year and his treatment of the decline of general interest in the great adventure of space exploration struck a very responsive note. But what happened at the end of the book? It seems as if what should be a sequel has been compressed into a vague, hastily written last chapter. Please, Mr. Baxter, after the exhilarating, wondrous yarn that you weave until the death of the last character, why did you let us down? Your "resurrection" scenario had me saying, "Huh?" How does it happen? Where's the speculative science? How are they going to build that log cabin without a Home Depot nearby? In addition to the Truth, there has to be better writing out there to do justice to such a great story line. Shucks, what a letdown!