Everything's rosy when Nadia Radzminsky takes a dream research job at GEM Pharmaceuticals: she'll be working for her professional idol, Dr. Luc Monnet; her fiancé is one of GEM's top salespeople; she's got all sorts of high tech toys to play with; and she'll get a million-dollar bonus if she can just figure out how to stabilize GEM's most promising molecule (dubbed Loki). But clouds quickly appear on the horizon in the form of Milos Dragovic, a Serbian mobster with a short fuse, a big wallet, and a profound interest in Loki's future. Nadia suspects Milos is blackmailing her boss, and she hires Jack to find out what's going on.

What Jack finds out isn't pretty: Loki is leading an underground life as Berzerk, a hot, new street drug that brings out the user's most aggressive behavior, frequently with deadly consequences. When Jack gets closer to the source of the mystery molecule, events take a very personal turn: Loki is derived from the blood of the last surviving rakosh from THE TOMB. With Gia and Vicky threatened by both the rakosh and the vengeful Serb, Jack must take on both the monster and the mob.