As series one of Primeval reached its devastating conclusion Professor Nick Cutter was having a rather bad day. And he still is. His estranged wife Helen has deceived him; tricking him into going through the anomalies one last time. But something has gone terribly wrong. Upon his return to the present, the world as he knows it has changed, and he and Helen are the only ones who know. When Series Two opens, Claudia Brown has never existed and the others have no idea who she was. Can Nick convince his team that their actions have inadvertently altered the course of nature? But he has absolutely no idea what went wrong or how he can fix it...

Along the way Nick and his team encounter some beastly opponents that find their way through the anomalies. From a family of raptors going wild in the aisles of a local shopping mall, a sabre-tooth at an amusement park, to a Woolly Mammoth holding up the traffic on the M25, the creatures just keep on coming...