Fisher, an ex-detective, decides to take one final case when a mysterious serial killer claims the lives of several young girls. Fisher, unable to find the culprit, turns to Osbourne, a writer who was once respected for his contributions to the field of criminology. Fisher begins to use Osbourne's technique, which involves empathizing with serial killers; however, as the detective becomes increasingly engrossed in this method, things take a disturbing turn.

Michael Elphick
as Fisher

Esmond Knight
as Osborne

Me Me Lai
as Kim

Jerold Wells
as Kramer

Ahmed El Shenawi
as Therapist

Astrid Henning-Jensen
as House Keeper

Janos Hersko
as Coroner

Stig Larsson
as Coroner's Assistant

Harry Harper
as Portier 1

Roman Moszkowicz
as Portier 2