Robert Ludlum's The Paris Option

In the dark of night a fiery explosion shatters a laboratory building in Paris' esteemed Pasteur Institute. Presumed dead is Emile Chambourd, one of the leaders in the global race to create a molecular, or DNA, computer. Unfortunately, Professor Chambourd kept the details of his work secret, and his notes were apparently destroyed with him in the bomb blast and raging fire that followed.
The scientific community does not expect a DNA computer to be developed for years. But suddenly, without explanation, U.S. military jets disappear from radar screens. Utilities across the Western states cease functioning, and telecommunications are interrupted, with devastating consequences. Washington, fearing a panic, assures the public this is merely the work of a supremely clever hacker, but only the enormous power and speed of a DNA computer could have caused such havoc.

Under the cover of visiting his friend Marty Zellerbach, severely injured when the Pasteur lab was destroyed, Covert-One agent Jon Smith flies to Paris to find the forces wielding the computer. Following a trail that leads him across two continents, Smith uncovers a web of deception that could cost millions of lives and reshape the world.