The series follows the story of Fatma (35), an ordinary cleaning lady who commits an unexpected murder while searching for her missing husband, Zafer, who was just released from jail. Zafer's dodgy underground associates soon find out what she did, and the only way for her to survive in this man's world is to continue killing. She gets away with it too - since no one takes her to be more than an ordinary cleaner, she becomes an invisible killer. In the end, murder becomes a release for the years of struggle and grief that she had repressed, and a new part of her identity she must confront.