Atlanta PD's best, Detective Lieutenant Noah McGraw and his partner, Detective Sergeant Holly Roark, are on the hunt once again for a deranged killer. This time, they're up against a real-life Dr. Jekyll and Mr. Hyde, a scientist of great talent-and great violence when things don't go his way.Dr. Michael Mordecai has spent his whole life searching for a cure to aging-and he's finally found it. There's just one thing standing in the way of him reaping his millions: his by-the-book research director, and the FDA. Biogen must be the first company to market with this miracle drug, and Mordecai will let nothing stop him. So what if a few test subjects might die?When Biogen's research director objects to starting human trials without further animal testing, Mordecai takes matters into his own hands. Days later, the research director loses control of his car and runs off the road. It looks like an accident, but is it? McGraw and Roark aren't so sure.With the way finally clear, Mordecai makes certain friends who'll happily look the other way while he tests his drug on elderly nursing home patients and the homeless. But those friends want their cut, and when their demands get too high, Dr. Mordecai turns into Mr. Hyde, and dead bodies with slashed throats start piling up. With his madness spreading like a virus, Mordecai starts a war with the clever detectives on his tail. Witnesses have spotted a man in a Frankenstein mask at the gruesome crime scenes. Without much else to go on, will McGraw and Roark find the vicious man behind the mask before he strikes again?