Moya bolshaya tayna – The Russian detective series "My Big Secret" tells the story of Sofia Kimaeva, a student who returns to her university dormitory from another country to conduct her own investigation into the mysterious death of her close friend. However, during the time Sonia was abroad, the situation has drastically changed. Someone has leaked personal diary entries of the deceased on the internet. Day by day, new secrets of the students and teachers become known to the public.