Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Classic Gerritsen

If you reach for a Tess Gerritsen novel, you know what you're going to get -- a psychological thriller cloaked in enough medical terminology to have you sounding like an ER doc, with some graphic blood-and-guts scenes thrown in for good measure. While Gerritsen's books are not for the faint of heart, they are well-plotted and well-written, with strong characters and plenty of action. Because they're all written from that recipe, they do tend to run together, and "Life Support" is another one that fits that bill. The storyline involves tracing a killer virus whose roots lie in "fountain of youth" hormone transplants. With all the recent talk about biochemical warfare and killer viruses, this book is sure to strike a chord with the public.One question -- what's with the naked babe on the cover of the book? I guess Gerritsen's having a hard time letting go of her romance roots.