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The unit specializes in the investigation of serial murders and is led by Van der Bijl, a former murder and robbery detective who gained fame for his handling of several high-profile cases. Each episode focuses on a serial killer. The main character, Colonel Piet van der Bijl, also known as Die Byl, is loosely modeled on the famous ex-detective Piet Byleveld.
A young suburban man who takes the same train every day, except on Sundays and holidays. When he his briefcase stolen in the rush hour he has some trouble recovering it.
