Fatmagül Ketenci is a girl who lives in a village on the Aegean coast with her brother who runs a dairy. She is engaged to marry a fisherman called Mustafa Nalçalı in a months time and dreams of getting away from her nagging sister-in-law who hates her. Kerim Ilgaz is a well-mannered blacksmith apprentice who lives with his aunt Meryem Aksoy known affectionately as "Ebe Nine" ("Granny Ebe") who is a healer of herbal medicine. The big event of the season is the engagement of the area's richest and most influential businessmen Reşat Yaşaran's son Selim to the politician Turaner Alagöz's daughter Meltem. Kerim meets up with his old friends Vural, Erdoğan and Selim. After the engagement party, all four of them go on a drinking and drug binge to celebrate whilst Fatmagül is off to see Mustafa off on another fishing trip and accidentally comes across them. Erdoğan, Selim and Vural gang-rape her, with Kerim passed out with no recollection of the event. A traumatized Fatmagül is later discovered the next morning by Ebe Nine while she is picking herbs. As the town go into an uproar over the rape incident, Kerim accepts the blame and agrees to marry Fatmagül as he mistakenly believes himself to be guilty and in order to protect his friends. As a result, Fatmagül and Kerim's families sell their properties and move to İstanbul to start a new life. But things become complicated due to the machinations of the Yaşarans and their unscrupulous lawyer Münir Telci who seek to protect themselves as well as Mustafa who seeks revenge.
"Fatmagül'ün Suçu Ne?" ("What is Fatmagül's fault?") is said to have been one of the most-watched Turkish television series ever, people are said to have been attracted by the unique storyline which has touch the hearts of many viewers. Viewers are taken on a journey and shown the ups and downs of the two main characters 'Fatmagül' and 'Kerim' what starts off as Battle again Evil soon ends on a positive note.