Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The formula is getting old.

Jack Du Brul is a good writer, he actually is a very good writer; but he also is a Clive Cussler clone. And that may not necessarily be a good thing. His hero Philip Mercer is a carbon copy of Dirk Pitt. As a matter of fact Du Brul is acting as ghost writer for Cussler latest installment of his Oregon Files series.His books are good entertainment, this one is a little exhausting, by the end of the book Mercer has gone around the world at least three times, unfortunately you are so tired you don't even care of the outcome anymore. The plots are also kind of dislodged, there is a plot line that starts in Area 51 that never gets resolved...Anyway, if you like the Cussler stile Du Brul fits the bill, but I would try some of his other offerings like "The Medusa Stone" or "Pandora's Curse" instead of This one.