At the center of the Turkish series "Zalim Istanbul" is the incredible story of the respectable Karadayı family, led by Agah Karadayı, a successful businessman and owner of a logistics company. Agah's beloved nephew, Nedim, is under his care, confined to a wheelchair as a result of an unfortunate accident. Agah's wife, the beautiful but ruthless Şeniz, is willing to do anything to get rid of Nedim, as he could potentially become her husband's heir to a vast fortune.