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.

Lena returns home to her family citrus farm after years spent studying abroad. However, her holiday turns sour when she beings to notice that her mother, Emory, and her father, Arno, are no longer in love the way she remembered. Lena confronts her mother about the emotional abuse she had endured in her marriage forcing Emory to decide if staying with her husband for the sake of love is enough