Birmingham, England, a sunny day in the city park. Children play, adults stroll - and a man lies dead in a pool of blood. His terrified fiancé screams for help. The assailant smiles, waves goodbye and strolls away to hide in the city. DCI Jones, together with his protégé, Detective Sergeant Phil Cryer are called to investigate the most difficult of crimes - an apparently motiveless and random attack. Hampered by a lack of resources, Jones and Cryer have to act quickly to prevent a murder spree.