This story of the excellent duo Preston and Child effectively gives a cold sweat when you think that this is perfectly plausible! Modify the human genome, even in a very laudable goal (to eradicate forever the flu continues to kill despite the vaccine: this is explained in the book that says vaccines, little by little, become ineffective given the many mutations of the virus and thus an effective vaccine, there is for example 5 years, is no longer 100% after this time) ... The book is well constructed and after a very good first part in ultra secure labs but scary the "Mount Dragon" (where a disaster that destroyed the occurs), the second part of the novel tells of a long chase in an unforgiving desert between the two "friends" (the sympathetic scientist, and very talented, and that which Guy Carson becomes his "girlfriend"), very brave (excruciating thirst and heat makes them endure a terrible ordeal) and closely followed by a killer (infected him and without his knowledge for months by a mutant virus) that continues a legendary treasure imagination ... because his imagination has become a pure delirium (in the first sense)! A book that holds spellbound on a topic "serious" or even serious.