Six years ago, three-year-old Viktoria Reiter and her father, Julian, vanished without a trace. When the investigation yielded no results after a year, the case was closed as a cold case with suspicion of murder-suicide. But Viktoria's mother, Anna Reiter, doubts this theory – and years later, she is still tirelessly searching for her child. Maryam Azadi, who investigated the case as a detective with the missing persons unit at the time, is also haunted by the mysterious case. When Anna, in her desperation, launches an appeal on social media, offering a reward for any information, no matter how small, leading to Viktoria's whereabouts, events take a dramatic turn: A homeless man claims Viktoria is still alive and asks Anna to meet him. Shortly afterward, Anna also disappears – and becomes the prime suspect in a murder case. Together with her colleague Hamza Kulina, who is simultaneously conducting an internal investigation, Maryam takes up the case.