The mother of an eight-year old autistic boy, Sonya has fought an uphill battle for survival in her hometown of Sofia, Bulgaria, but has managed to take care of her son against almost impossible odds. The safe haven she had found in her marriage to the successful advertising executive Anton, has started to falter after he has lost his job and she has become the sole supporter of the family, and she can only watch as her ambitious husband gambles their savings away in a desperate attempt to become rich. When Anton responds to an ad on the internet and gets a job as the caretaker of a luxurious mansion in a rural part of the country, Sonya sees this as an answer to her prayers. As soon as they arrive at the mansion, however, Sonya starts to get an anxious feeling about the whole thing, especially after meeting the eccentric owner. They quickly learn that their new home is anything but ordinary when a message inexplicably appears on a wall, promising them riches if they perform a simple act. They perform the act out of curiosity and a reward is instantly delivered. When a second message appears – raising the stakes and increasing the promised reward – Sonya begins to realize that they are dealing with very sinister forces, intent on some scheme for which the three of them are the perfect victims.