Jack is hired by Dr. Nadia Radzminsky, a young researcher who's concerned about the safety of her boss and mentor. She fears he's being threatened or blackmailed by high-profile hood Milos Dragovic. Jack pokes around and soon finds himself knee-deep in the glossy underworld of designer drugs.

The hot new substance that's sweeping the city goes by many names, but its most common street handle is Berzerk. Not just for all-night raves, it's worming its way into daily life at all levels of society. Used in just the right amount, it enhances performance in any field: but take too much and you veer into mindless murderous rage. The street folk don't call it Berzerk for nothing.

As Jack tracks Berzerk through a maze of legal and illegal pharmaceuticals, he makes an enemy of Milos Dragovic. Soon Dragovic's goons are threatening those Jack holds most dear. And when Jack uncovers the terrifying truth behind Berzerk's ultimate source, he realizes that a maleficent force far greater than Milos Dragovic is at work...and Jack and Nadia and everyone they love are in far more danger than they could have imagined.