Synopsis

In the 1990s the conflict in Yugoslavia was used as cover for a series of killings by a man working with private security companies but following his own

 agenda.  Fascinated with ancient European human sacrifice, and in particular evidence gained from the so called bog bodies such as Tollund Man and

 Lindow Man, he was carrying out what he regarded as experimental archaeology.

After all, what better way could there be of understanding the psychology of

human sacrifice than spilling human blood yourself?

Some years later, Juliet Corman, instructor for a survival training company run by

 TV personality Ray Morris, invites her sister Holly along to the first course in

 a new centre in woodland in Kent, not knowing that the killer has returned

 home, has read Ray's press release, and is waiting for his newest batch of test subjects. 

When course members begin to die one by one  Holly and Juliet are forced to face the killer themselves in a real fight for survival.